TETRACHORD
Tet"ra*chord, n. Etym: [L. tetrachordon, Gr. Tetra-) + tétrachorde.]
(Anc. Mus.)
Defn: 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.
TETRACHOTOMOUS
Tet`ra*chot"o*mous, a. Etym: [Gr. (Bot.)
Defn: Having a division by fours; separated into four parts or series, or into series of fours.
TETRACID
Tet*rac"id, a. Etym: [Tetra + acid.] (Chem.)
Defn: 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.
TETRACOCCOUS
Tet`ra*coc"cous, a. Etym: [See Tetra-, and Coccus.] (Bot.)
Defn: Having four cocci, or carpels.
TETRACOLON
Tet`ra*co"lon, n. Etym: [Gr. Tetra-) + (Pros.)
Defn: A stanza or division in lyric poetry, consisting of four verses or lines. Crabb.