Source : Webster's Revised Unabridged Dictionary (1913)

Cryptobranchiata \Cryp`to*bran`chi*a"ta\ (kr?p`t?-bra?`k?-?"t?),
   n. pl. [NL., fr. Gr. krypto`s hidden + L. branchia a gill.]
   (Zo["o]l.)
   (a) A division of the Amphibia; the Derotremata.
   (b) A group of nudibranch mollusks.