a. (sb.) Zool. [ad. mod.L. Trionychoidea, neut. pl., f. TRIONYX, generic name: see -OID.] Belonging to the suborder Trionychoidea of Chelonia, typified by the genus Trionyx of soft-shelled turtles. b. sb. A turtle of this suborder.
1886. Günther, in Encycl. Brit., XX. 469/1. A distinct Trionycoid genus.
1889. Nicholson & Lydekker, Palæont., II. liii. 1117. The marked resemblance of the palate and the general aspect of the Trionychoid skull to that of existing Pleurodira.
