TRIOLEIN
Tri*o"le*in, n. Etym: [Pref. tri- + olein.] (Physiol. Chem.)
Defn: See Olein.
TRIOLET
Tri"o*let, n. Etym: [F. triolet. See Trio.]
Defn: A short poem or stanza of eight lines, in which the first line is repeated as the fourth and again as the seventh line, the second being, repeated as the eighth. Brande & C.
TRIONAL Tri"o*nal, n. [Pref. tri- + sulphonal; — so called because it contains three ethyls.] (Chem.)
Defn: A compound similar to sulphonal, used as a hypnotic in medicine.
TRIONYCHOIDEA
Tri*on`y*choi"de*a, n. pl. Etym: [NL. See Trionyx, and -old.] (Zoöl.)
Defn: A division of chelonians which comprises Trionyx and allied genera; — called also Trionychoides, and Trionychina.
TRIONYX
Tri*on"yx, n. Etym: [NL., fr. Gr. Tri-) + (Zoöl.)
Defn: A genus of fresh-water or river turtles which have the shell imperfectly developed and covered with a soft leathery skin. They are noted for their agility and rapacity. Called also soft tortoise, soft-shell tortoise, and mud turtle.