Chapter Tetrapnuemonian to Thalamifloral of T by Webster's Dictionary (1913 Edition)

Tetrathionic
(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.

Tetratomic
(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.

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

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

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

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

Tetrazone
(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.

Tetric
(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.

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

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

Tetrinic
(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.

Tetrodon
(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.

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

Tetrol
(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.]

Tetrolic
(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.

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

Tetryl
(Tet"ryl) n. [Tetra- + -yl.] (Chem.) Butyl; — so called from the four carbon atoms in the molecule.