'Selachian' definitions:

Definition of 'selachian'

From: WordNet
noun
Any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks; rays; skates [syn: elasmobranch, selachian]

Definition of 'Selachian'

From: GCIDE
  • Selachian \Se*la"chi*an\, n. (Zool.) One of the Selachii. See Illustration in Appendix. [1913 Webster]