Tri"o*nal(?), n. [Pref. tri- + sulphonal; -- so called because it contains three ethyls.] (Chem.) A compound similar to sulphonal, used as a hypnotic in medicine.
[Webster 1913 Suppl.]
Tri*on`y*choi"de*a(?), n. pl. [NL. See Trionyx, and -old.] (Zol.) A division of chelonians which comprises Trionyx and allied genera; -- called also Trionychoides, and Trionychina.
Tri*on"yx(?), n. [NL., fr. Gr. (see Tri-) + a claw.] (Zol.) 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.
The common American species (Trionyx ferox syn. Aspidonectus ferox) becomes over a foot in length and is very voracious. Similar species are found in Asia and Africa.
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