A urodele amphibian with concealed or covered gills; specifically a giant salamander of the genus Cryptobranchus or the family Cryptobranchidae, such as the hellbender.
1rare Designating urodele amphibians (or their developmental stages) having concealed or covered gills; of or relating to such amphibians.
2= cryptobranchiate .
Late 19th century; earliest use found in Medical Times and Gazette. From crypto- + -branch.