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.]
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.
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&?;.