||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.