Webster’s Revised Unabridged Dictionary · 1913
Elasmobranchii
E·las′mo·bran′chi·i, n. pl. [NL., fr. Gr. ἐλισμός a metal plate + L. branchia a gill.] (Zoöl.) A subclass of fishes, comprising the sharks, the rays, and the Chimæra. The skeleton is mainly cartilaginous.