Webster’s Revised Unabridged Dictionary · 1913
Cryptobranchiata
Cryp′to·bran′chi·a′ta (kr?p′t?-bra?′k?- ?′t?), n. pl. [NL., fr. Gr. κρυπτός hidden + L. branchia a gill.] (Zoöl.) (a) A division of the Amphibia; the Derotremata. (b) A group of nudibranch mollusks.