Part 17

Syn. — Proof; evidence; attestation; witness; affirmation; confirmation; averment. — Testimony, Proof, Evidence. Proof is the most familiar, and is used more frequently (though not exclusively) of facts and things which occur in the ordinary concerns of life. Evidence is a word of more dignity, and is more generally applied to that which is moral or intellectual; as, the evidences of Christianity, etc. Testimony is what is deposed to by a witness on oath or affirmation. When used figuratively or in a wider sense, the word testimony has still a reference to some living agent as its author, as when we speak of the testimony of conscience, or of doing a thing in testimony of our affection, etc. Testimony refers rather to the thing declared, evidence to its value or effect. "To conform our language more to common use, we ought to divide arguments into demonstrations, proofs, and probabilities; ba proofs, meaning such arguments from experience as leave no room for doubt or opposition." Hume. "The evidence of sense is the first and highest kind of evidence of which human nature is capable." Bp. Wilkins. "The proof of everything must be by the testimony of such as the parties produce." Spenser.

Tes"ti*mo*ny (?), v. t. To witness; to attest; to prove by testimony. [Obs.] Shak.

Tes"ti*ness (?), n. The quality or state of being testy; fretfulness; petulance.

Testiness is a disposition or aptness to be angry.

Locke.

Test"ing (?), n. 1. The act of testing or proving; trial; proof.

2. (Metal.) The operation of refining gold or silver in a test, or cupel; cupellation.

Testing machine (Engin.), a machine used in the determination of the strength of materials, as iron, stone, etc., and their behavior under strains of various kinds, as elongation, bending, crushing, etc.

||Tes"tis (?), n.; pl. Testes (#). [L.] (Anat.) A testicle. || Tes"ton (?), n. A tester; a sixpence. [Obs.]

Tes*tone" (?), n. [Cf. Pg. testão, tostão. See Testoon.] A silver coin of Portugal, worth about sixpence sterling, or about eleven cents. Homans.

Tes*toon" (?), n. [It. testone. See Tester a coin.] An Italian silver coin. The testoon of Rome is worth 1s. 3d. sterling, or about thirty cents. Homans.

Tes*tu"di*nal (?), a. [See Testudo.] (Zoöl.) Of, pertaining to, or resembling, a tortoise.

Tes*tu`di*na"ri*ous (?), a. (Zoöl.) Of or pertaining to the shell of a tortoise; resembling a tortoise shell; having the color or markings of a tortoise shell.

||Tes*tu`di*na"ta (?), n. pl. [Nl. See Testudo.] (Zoöl.) An order of ||reptiles which includes the turtles and tortoises. The body is ||covered by a shell consisting of an upper or dorsal shell, called the ||carapace, and a lower or ventral shell, called the plastron, each of ||which consists of several plates. || { Tes*tu"di*nate (?), Tes*tu"di*na`ted (?), } a. [L. testudinatus, fr. testudo, - inis, a tortoise, an arch or vault.] Resembling a tortoise shell in appearance or structure; roofed; arched; vaulted.

Tes`tu*din"e*ous (?), a. [L. testudineus.] Resembling the shell of a tortoise.

||Tes*tu"do (?), n.; pl. Testudines (#). [L., from testa the shell of ||shellfish, or of testaceous animals.] 1. (Zoöl.) A genus of tortoises ||which formerly included a large number of diverse forms, but is now ||restricted to certain terrestrial species, such as the European land ||tortoise (Testudo Græca) and the gopher of the Southern United States. || 2. (Rom. Antiq.) A cover or screen which a body of troops formed with their shields or targets, by holding them over their heads when standing close to each other. This cover resembled the back of a tortoise, and served to shelter the men from darts, stones, and other missiles. A similar defense was sometimes formed of boards, and moved on wheels.

3. (Mus.) A kind of musical instrument. a species of lyre; — so called in allusion to the lyre of Mercury, fabled to have been made of the shell of a tortoise.

Tes"ty (?), a. [Compar. Testier (?); superl. Testiest.] [OF. testu obstinate, headstrong, F. têtu, fr. OF. teste the head, F. tête. See Test a cupel.] Fretful; peevish; petulant; easily irritated.

Must I observe you? must I stand and crouch Under your testy humor?

Shak.

I was displeased with myself; I was testy.

Latimer.

Te*tan"ic (?), a. [Cf. L. tetanicus suffering from tetanus, Gr. &?;, F. tétanique.] 1. (Physiol.) Of or pertaining to tetanus; having the character of tetanus; as, a tetanic state; tetanic contraction.

This condition of muscle, this fusion of a number of simple spasms into an apparently smooth, continuous effort, is known as tetanus, or tetanic contraction.

Foster.

2. (Physiol. & Med.) Producing, or tending to produce, tetanus, or tonic contraction of the muscles; as, a tetanic remedy. See Tetanic, n.

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Te*tan"ic (?), n. (Physiol. & Med.) A substance (notably nux vomica, strychnine, and brucine) which, either as a remedy or a poison, acts primarily on the spinal cord, and which, when taken in comparatively large quantity, produces tetanic spasms or convulsions.

Tet"a*nin (?), n. (Physiol. Chem.) A poisonous base (ptomaine) formed in meat broth through the agency of a peculiar microbe from the wound of a person who has died of tetanus; — so called because it produces tetanus as one of its prominent effects.

Tet`a*ni*za"tion (?), n. (Physiol.) The production or condition of tetanus.

Tet"a*nize (?), v. t. (Physiol.) To throw, as a muscle, into a state of permanent contraction; to cause tetanus in. See Tetanus, n., 2.

Tet"a*noid (?), a. [Tetanus + - oid.] (Med. & Physiol.) Resembling tetanus.

Tet`a*no*mo"tor (?), n. (Physiol.) An instrument from tetanizing a muscle by irritating its nerve by successive mechanical shocks.

||Tet"a*nus (?), n. [L., fr. Gr. &?;, fr. &?; stretched, &?; to ||stretch.] 1. (Med.) A painful and usually fatal disease, resulting ||generally from a wound, and having as its principal symptom ||persistent spasm of the voluntary muscles. When the muscles of the ||lower jaw are affected, it is called locked-jaw, or lickjaw, and it ||takes various names from the various incurvations of the body ||resulting from the spasm. || 2. (Physiol.) That condition of a muscle in which it is in a state of continued vibratory contraction, as when stimulated by a series of induction shocks.

Tet"a*ny (?), n. (Med.) A morbid condition resembling tetanus, but distinguished from it by being less severe and having intermittent spasms.

Te*tard" (?), n. (Zoöl.) A gobioid fish (Eleotris gyrinus) of the Southern United States; — called also sleeper.

Te*tar`to*he"dral (?), a. [Gr. &?; fourth + &?; base.] (Crystallog.) Having one fourth the number of planes which are requisite to complete symmetry. — Te*tar`to*he"dral*ly, adv.

Te*tar`to*he"drism (?), n. (Crystallog.) The property of being tetartohedral.

Te*taug" (?), n. (Zoöl.) See Tautog. [R.]

Tetch"i*ness, n. See Techiness.

Tetch"y (?), a. See Techy. Shak.

||Tête (?), n. [F., the head. See Tester a covering.] A kind of wig; ||false hair. || ||Tête`-à-tête" (tt`*tt"), n. [F., head to head. See Tester a covering, ||Test a cupel.] 1. Private conversation; familiar interview or ||conference of two persons. || 2. A short sofa intended to accomodate two persons.

||Tête`-à-tête", a. Private; confidential; familiar. || She avoided tête-à-tête walks with him.

C. Kingsley.

||Tête`-à-tête", adv. Face to face; privately or confidentially; ||familiarly. Prior. || ||Tête`-de-pont" (tt`de*pôN"), n.; pl. Têtes-de-pont (#). [F., head of ||a bridge.] (Mil.) A work thrown up at the end of a bridge nearest the ||enemy, for covering the communications across a river; a bridgehead. || Te*tel" (?), n. (Zoöl.) A large African antelope (Alcelaphus tora). It has widely divergent, strongly ringed horns.

Teth"er (?), n. [Formerly tedder, OE. tedir; akin to LG. tider, tier, Icel. tj&?;r, Dan. töir. √64.] A long rope or chain by which an animal is fastened, as to a stake, so that it can range or feed only within certain limits.

Teth"er, v. t. [imp. & p. p. Tethered (?); p. pr. & vb. n. Tethering.] To confine, as an animal, with a long rope or chain, as for feeding within certain limits.

And by a slender cord was tethered to a stone.

Wordsworth.

Te*thy"dan (?), n. [See Tethys.] (Zoöl.) A tunicate.

||Te`thy*o"de*a (?), n. pl. [NL., fr. Tethys + Gr. &?; form.] (Zoöl.) A ||division of Tunicata including the common attached ascidians, both ||simple and compound. Called also Tethioidea. || Te"thys (?), n. [NL., fr. Gr. &?; an oyster, or &?; a kind of ascidian.] (Zoöl.) A genus of a large naked mollusks having a very large, broad, fringed cephalic disk, and branched dorsal gills. Some of the species become a foot long and are brilliantly colored.

Tet"ra- (?). [Gr. te`tra-, from te`sares, te`ttares, four. See Four.] 1. A combining form or prefix signifying four, as in tetrabasic, tetrapetalous.

2. (Chem.) A combining form (also used adjectively) denoting four proportional or combining parts of the substance or ingredient denoted by the term to which it is prefixed, as in tetra-chloride, tetroxide.

Tet`ra*bas"ic (?), a. [Tetra- + basic.] (Chem.) Capable of neutralizing four molecules of a monacid base; having four hydrogen atoms capable of replacement by bases; quadribasic; — said of certain acids; thus, normal silicic acid, Si(OH)4, is a tetrabasic acid.

Tet`ra*bor"ic (?), a. [Tetra- + boric.] (Chem.) Same as Pyroboric.

||Tet`ra*bran`chi*a"ta (?), n. pl. [NL. See Tetra-, and Branchia.] ||(Zoöl.) An order of Cephalopoda having four gills. Among living ||species it includes only the pearly nautilus. Numerous genera and ||species are found in the fossil state, such as Ammonites, Baculites, ||Orthoceras, etc. || Tet`ra*bran`chi*ate (?), a. [Tetra + branchiate.] (Zoöl.) Of or pertaining to the Tetrabranchiata. — n. One of the Tetrabranchiata.

Tet`ra*car"pel (?), a. [Tetra- + carpellary.] (Bot.) Composed of four carpels.

Tet"ra*chord (?), n. [L. tetrachordon, Gr. &?;, from &?; four-stringed; te`tra- (see Tetra-) + &?; a chord: cf. F. tétrachorde.] (Anc. Mus.) A scale series of four sounds, of which the extremes, or first and last, constituted a fourth. These extremes were immutable; the two middle sounds were changeable.

Tet`ra*chot"o*mous (?), a. [Gr. te`tracha in four parts + te`mnein to cut.] (Bot.) Having a division by fours; separated into four parts or series, or into series of fours.

Tet*rac"id (?), a. [Tetra + acid.] (Chem.) Capable of neutralizing four molecules of a monobasic acid; having four hydrogen atoms capable of replacement ba acids or acid atoms; — said of certain bases; thus, erythrine, C4H6(OH)4, is a tetracid alcohol.

Tet`ra*coc"cous (?), a. [See Tetra-, and Coccus.] (Bot.) Having four cocci, or carpels.

Tet`ra*co"lon (?), n. [Gr. &?; with four members; te`tra- (see Tetra-) + &?; limb, member.] (Pros.) A stanza or division in lyric poetry, consisting of four verses or lines. Crabb.

||Te`tra*co*ral"la (?), n. pl. [NL. See Tetra-, and Corallum.] ||(Paleon.) Same as Rugosa. || Te*trac`ti*nel"lid (?), n. (Zoöl.) Any species of sponge of the division Tetractinellida. Also used adjectively.

||Te*trac`ti*nel"li*da (?), n. pl. [NL., from Gr. te`tra- tetra- + &?;, ||&?;, ray, spoke.] (Zoöl.) A division of Spongiæ in which the spicules ||are siliceous and have four branches diverging at right angles. ||Called also Tetractinellinæ. || Tet"rad (?), n. [L. tetras, - adis, Gr. &?;, &?;: cf. F. tétrade.] 1. The number four; a collection of four things; a quaternion.

2. (Chem.) A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.

{ Tet`ra*dac"tyl, Tet`ra*dac"tyle } (?), a. [Cf. F. tétradactyle.] (Zoöl.) Tetradactylous.

Tet`ra*dac"tyl*ous (?), a. [Gr. &?;; te`tra- (see Tetra-) + &?; finger, toe.] (Zoöl.) Having, or characterized by, four digits to the foot or hand.

Tet`ra*dec"ane (?), n. [Tetra- + Gr. &?; ten.] (Chem.) A light oily hydrocarbon, C14H30, of the marsh-gas series; — so called from the fourteen carbon atoms in the molecule.

||Tet`ra*de*cap"o*da (?), n. pl. [NL. See Tetra-, and Decapoda.] ||(Zoöl.) Same as Arthrostraca. || Tet*rad"ic (?), a. (Chem.) Of or pertaining to a tetrad; possessing or having the characteristics of a tetrad; as, a carbon is a tetradic element.

Tet"ra*dite (?), n. [See Tetrad.] A person in some way remarkable with regard to the number four, as one born on the fourth day of the month, or one who reverenced four persons in the Godhead. Smart.

Tet"ra*don (?), n. (Zoöl.) See Tetrodon.

Tet"ra*dont (?), a. & n. (Zoöl.) See Tetrodont.

{ Tet"ra*drachm (?), ||Tet`ra*drach"ma (?), } n. [NL. tetradrachma, fr. Gr. tetra`drachmon; te`tra- (see Tetra-) + drachmh` drachm, drachma.] A silver coin among the ancient Greeks, of the value of four drachms. The Attic tetradrachm was equal to 3s. 3d. sterling, or about 76 cents.

Tet*rad"y*mite (?), n. [Gr. tetra`dymos fourfold. So named from its occurrence in compound twin crystals, or fourlings.] (Min.) A telluride of bismuth. It is of a pale steel-gray color and metallic luster, and usually occurs in foliated masses. Called also telluric bismuth.

||Tet`ra*dy*na"mi*a (?), n. pl. [NL., fr. Gr. te`tra- (see Tetra-) + ||&?; power.] (Bot.) A Linnæan class of plants having six stamens, four ||of which are longer than the others. || Tet`ra*dy*na"mi*an (?), n. (Bot.) A plant of the order Tetradynamia.

{ Tet`ra*dy*na"mi*an (?), Tet`ra*dyn"a*mous (?), } a. (Bot.) Belonging to the order Tetradynamia; having six stamens, four of which are uniformly longer than the others.

Tet"ra*gon (?), n. [L. tetragonum, Gr. tetra`gwnon; te`tra- (see Tetra-) + gwni`a corner, angle: cf. F. tétragone.] 1. (Geom.) A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.

2. (Astrol.) An aspect of two planets with regard to the earth when they are distant from each other ninety degrees, or the fourth of a circle. Hutton.

Te*trag"o*nal (?), a. 1. (Geom.) Of or pertaining to a tetragon; having four angles or sides; thus, the square, the parallelogram, the rhombus, and the trapezium are tetragonal fingers.

2. (Bot.) Having four prominent longitudinal angles.

3. (Crystallog.) Designating, or belonging to, a certain system of crystallization; dimetric. See Tetragonal system, under Crystallization.

||Tet`ra*gram"ma*ton (?), n. [NL., fr. Gr. &?;; te`tra- (see Tetra-) + ||&?; a letter.] The mystic number four, which was often symbolized to ||represent the Deity, whose name was expressed by four letters among ||some ancient nations; as, the Hebrew JeHoVaH, Greek qeo`s, Latin ||deus, etc. || ||Tet`ra*gyn"i*a (?), n. pl. [NL., fr. Gr. te`tra- (see Tetra-) + gynh` ||a woman, female.] (Bot.) A Linnæan order of plants having four styles. || { Tet`ra*gyn"i*an (?), Te*trag"y*nous (?), } a. (Bot.) Belonging to the order Tetragynia; having four styles.

Tet`ra*he"dral (?), a. [See Tetrahedron.] 1. Having, or composed of, four sides.

2. (Crystallog.) (a) Having the form of the regular tetrahedron. (b) Pertaining or related to a tetrahedron, or to the system of hemihedral forms to which the tetrahedron belongs.

Tetrahedral angle (Geom.), a solid angle bounded or inclosed by four plane angles.

Tet`ra*he"dral*ly, adv. In a tetrahedral manner.

Tet`ra*he"drite (?), n. [So called because the crystals of the species are commonly tetrahedrons.] (Min.) A sulphide of antimony and copper, with small quantities of other metals. It is a very common ore of copper, and some varieties yield a considerable presentage of silver. Called also gray copper ore, fahlore, and panabase.

Tet`ra*he"dron (?), n. [Tetra- + Gr. &?; seat, base, fr. &?; to sit.] (Geom.) A solid figure inclosed or bounded by four triangles.

In crystallography, the regular tetrahedron is regarded as the hemihedral form of the regular octahedron.

Regular tetrahedron (Geom.), a solid bounded by four equal equilateral triangles; one of the five regular solids.

Tet`ra*hex`a*he"dral (?), a. (Crystallog.) Pertaining to a tetrahexahedron.

Tet`ra*hex`a*he"dron (?), n. [Tetra- + hexahedron.] (Crystallog.) A solid in the isometric system, bounded by twenty-four equal triangular faces, four corresponding to each face of the cube.

Tet`ra*kis*hex`a*he"dron (?), n. [Gr. &?; four times + E. hexahedron.] (Crystallog.) A tetrahexahedron.

Tet"ra*ko*sane` (?), n. [Tetra- + Gr. &?; twenty.] (Chem.) A hydrocarbon, C24H50, resembling paraffin, and like it belonging to the marsh-gas series; — so called from having twenty-four atoms of carbon in the molecule.

Te*tral"o*gy (?), n. [Gr. &?;; te`tra- (see Tetra-) + &?; a speech, discourse: cf. F. tétralogie.] (Gr. Drama) A group or series of four dramatic pieces, three tragedies and one satyric, or comic, piece (or sometimes four tragedies), represented consequently on the Attic stage at the Dionysiac festival.

A group or series of three tragedies, exhibited together without a fourth piese, was called a trilogy.

||Te*tram"e*ra (?), n. pl. [NL. See Tetramerous.] (Zoöl.) A division of ||Coleoptera having, apparently, only four tarsal joints, one joint ||being rudimentary. || Te*tram"er*ous (?), a. [Tetra- + Gr. &?; part.] 1. (Bot.) Having the parts arranged in sets of four; as, a tetramerous flower.

2. (Zoöl.) Having four joints in each of the tarsi; — said of certain insects.

Te*tram"e*ter (?), n. [L. tetrametrus, Gr. &?;; te`tra- (see Tetra-) + &?; a measure: cf. F. tétramètre.] (GR. & Latin Pros.) A verse or line consisting of four measures, that is, in iambic, trochaic, and anapestic verse, of eight feet; in other kinds of verse, of four feet.

Tet`ra*meth"yl*ene (?), n. [Tetra- + methylene.] (Chem.) (a) A hypothetical hydrocarbon, C4H8, analogous to trimethylene, and regarded as the base of well-known series or derivatives. (b) Sometimes, an isomeric radical used to designate certain compounds which are really related to butylene.

Tet"ra*morph (?), n. [Tetra- + Gr. &?; form, figure: cf. Gr. &?; fourfold.] (Christian Art) The union of the four attributes of the Evangelists in one figure, which is represented as winged, and standing on winged fiery wheels, the wings being covered with eyes. The representations of it are evidently suggested by the vision of Ezekiel (ch. i.)

||Te*tran"dri*a (?), n. pl. [NL., from Gr. te`tra- (see Tetra-) + &?;, ||&?;, a man, male.] (Bot.) A Linnæan class of plants having four ||stamens. || { Te*tran"dri*an (?), Te*tran"drous (?), } a. (Bot.) Belonging to the class Tetrandria.

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Te*tra"o*nid (?), n. [L. tetrao a heath cock, grouse, Gr. &?;: cf. F. tétraonide.] (Zoöl.) A bird belonging to the tribe of which the genus Tetrao is the type, as the grouse, partridge, quail, and the like. Used also adjectively.

Tet`ra*pet"al*ous (?), a. [Tetra- + petal.] (Bot.) Containing four distinct petals, or flower leaves; as, a tetrapetalous corolla.

{ Tet`ra*phar"ma*com (?), Tet`ra*phar"ma*cum (?) }, n. [NL. tetrapharmacon, L. tetrapharmacum, Gr. &?;; te`tra- (see Tetra-) + &?; a drug.] (Med.) A combination of wax, resin, lard, and pitch, composing an ointment. Brande & C.

Tet`ra*phe"nol (?), n. [Tetra- + phenol.] (Chem.) Furfuran. [Obs.]

Te*traph"yl*lous (?), a. [Tetra- + Gr. &?; a leaf.] (Bot.) Having four leaves; consisting of four distinct leaves or leaflets.

||Tet"ra*pla (?), n.; etymologically pl., but syntactically sing. [NL., ||fr. Gr. tetraplo`os, tetraploy^s, fourfold.] A Bible consisting of ||four different Greek versions arranged in four columns by Origen; ||hence, any version in four languages or four columns. || ||Tet`rap*neu"mo*na (?), n. pl. [NL. See Tetra-, and Pneumo-.] (Zoöl.) ||A division of Arachnida including those spiders which have four ||lungs, or pulmonary sacs. It includes the bird spiders (Mygale) and ||the trapdoor spiders. See Mygale. || Tet`rap*nue*mo"ni*an (?), n. (Zoöl.) One of the Tetrapneumona.

Tet"ra*pod (?), n. [Gr. &?; fourfooted; te`tra- (see Tetra-) + &?;, &?;, foot.] (Zoöl.) An insect characterized by having but four perfect legs, as certain of the butterflies.

Te*trap"o*dy (?), n. [Gr. &?;.] A set of four feet; a measure or distance of four feet.

Te*trap"ter*an (?), n. [See Tetrapterous.] (Zoöl.) An insect having four wings.

Te*trap"ter*ous (?), a. [Gr. &?;; te`tra- (see Tetra-) + &?; wing.] (Zoöl.) Having four wings.

Tet"rap*tote (?), n. [L. tetraptotum, Gr. &?;.] (Gram.) A noun that has four cases only. Andrews.

Te"trarch (?), n. [L. tetrarches, Gr. &?;, &?;; te`tra- (see Tetra-) + &?; a ruler, &?; to lead; rule: cf. F. tétrarque. See Arch, a.] (Rom. Antiq.) A Roman governor of the fourth part of a province; hence, any subordinate or dependent prince; also, a petty king or sovereign.

Te"trarch, a. Four. [Obs.] Fuller.

Te*trarch"ate (?), n. [Cf. F. tétrarchat.] (Rom. Antiq.) A tetrarchy.

Te*trarch"ic*al (?), a. [Gr. &?;.] Of or pertaining to a tetrarch or tetrarchy. Bolingbroke.

Tet"rarch*y (?), n.; pl. Tetrarchies (#). [L. tetrarchia, Gr. &?;: cf. F. tétrarchie.] (Rom. Antiq.) The district under a Roman tetrarch; the office or jurisdiction of a tetrarch; a tetrarchate.

Tet`ra*schis"tic (?), a. [Gr. &?; divided into four parts; te`tra- tetra- + &?; to split.] (Biol.) Characterized by division into four parts.

Tet`ra*sep"al*ous (?), a. [Tetra- + sepal.] (Bot.) Having four sepals.

Tet`ra*spas"ton (?), n. [NL., fr. Gr. te`tra- (see Tetra-) + &?; to draw, pull.] (Mach.) A machine in which four pulleys act together. Brande & C.

Tet`ra*sper"mous (?), a. [Tetra- + Gr. &?; a seed.] (Bot.) Having four seeds.

Tetraspermous plant, a plant which produces four seeds in each flower.

Tet"ra*spore (?), n. [Tetra- + spore.] (Bot.) A nonsexual spore, one of a group of four regularly occurring in red seaweeds. — Tet`ra*spor"ic (#), a.

Te*tras"tich (?), n. [L. tetrastichon, Gr. &?;; te`tra- (see Tetra-) + &?; a row, verse.] A stanza, epigram, or poem, consisting of four verses or lines. Pope.

Tet"ra*style (?), a. [L. tetrastylon, Gr. &?; with four pillars in front; te`tra- (see Tetra-) + &?; a column.] (Arch.) Having four columns in front; — said of a temple, portico, or colonnade. — n. A tetrastyle building.

{ Tet`ra*syl*lab"ic (?), Tet`ra*syl*lab"ic*al (?), } a. [Cf. F. tétrasyllabique.] Consisting of, or having, four syllables; quadrisyllabic.

Tet"ra*syl`la*ble (?), n. [Tetra- + syllable: cf. Gr. &?; of four syllables.] A word consisting of four syllables; a quadrisyllable.

Tet`ra*the"cal (?), a. [Tetra- + thecal.] (Bot.) Having four loculaments, or thecæ.

Tet`ra*thi"on*ate (?), n. (Chem.) A salt of tetrathionic acid.

Tet`ra*thi*on"ic (?), a. [Tetra- + thionic.] (Chem.) Of, pertaining to, or designating, a thionic derivative, H2S4O6, of sulphuric acid, obtained as a colorless, odorless liquid.

Tet`ra*tom"ic (?), a. [Tetra- + atomic.] (Chem.) (a) Consisting of four atoms; having four atoms in the molecule, as phosphorus and arsenic. (b) Having a valence of four; quadrivalent; tetravalent; sometimes, in a specific sense, having four hydroxyl groups, whether acid or basic.

Te*trav"a*lence (?), n. (Chem.) The quality or state of being tetravalent; quadrivalence.

Te*trav"a*lent (?), a. [Tetra- + L. valens, -entis, p. pr.] (Chem.) Having a valence of four; tetratomic; quadrivalent.

Te*trax"ile (?), a. [Tetra- + axile.] (Zoöl.) Having four branches diverging at right angles; — said of certain spicules of sponges.

Tet*raz"o- (?), a. [Tetra- + azo- .] (Chem.) A combining form (also used adjectively), designating any one of a series of double derivatives of the azo and diazo compounds containing four atoms of nitrogen.

Tet"ra*zone (?), n. (Chem.) Any one of a certain series of basic compounds containing a chain of four nitrogen atoms; for example, ethyl tetrazone, (C2H5)2N. N2.N(C2H5)2, a colorless liquid having an odor of leeks.

{ Tet"ric (?), Tet"ri*cal (?), } a. [L. tetricus, taetricus, from teter, taeter, offensive, foul.] Forward; perverse; harsh; sour; rugged. [Obs.] — Tet"ric*al*ness, n.

Te*tric"i*ty (?), n. [L. tetricitas, taetricitas.] Crabbedness; perverseness. [Obs.]

Tet"ric*ous (?), a. Tetric. [Obs.]

Te*trin"ic (?), a. [See Tetra-.] (Chem.) Of, pertaining to, or designating, a complex ketonic acid, C5H6O3, obtained as a white crystalline substance; — so called because once supposed to contain a peculiar radical of four carbon atoms. Called also acetyl-acrylic acid.

Tet"ro*don (?), n. [Tetra- + Gr. &?;, &?;, tooth.] (Zoöl.) Any one of numerous species of plectognath fishes belonging to Tetrodon and allied genera. Each jaw is furnished with two large, thick, beaklike, bony teeth. [Written also tetradon.]

The skin is usually spinous, and the belly is capable of being greatly distended by air or water. It includes the swellfish, puffer (a), and similar species.

Tet"ro*dont (?), a. (Zoöl.) Of or pertaining to the tetrodons. — n. A tetrodon. [Written also tetradont, and tetraodont.]

Tet"rol (?), n. [Tetra- + benzol.] (Chem.) A hypothetical hydrocarbon, C4H4, analogous to benzene; — so called from the four carbon atoms in the molecule.

Tetrol phenol, furfuran. [Obs.]

Tet*rol"ic (?), a. (Chem.) Of, pertaining to, or designating, an acid, C3H3.CO2H, of the acetylene series, homologous with propiolic acid, obtained as a white crystalline substance.

Tet*rox"ide (?), n. [Tetra- + oxide.] (Chem.) An oxide having four atoms of oxygen in the molecule; a quadroxide; as, osmium tetroxide, OsO&?;.