Rays

• Skates
• Any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales sharks

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1859, from Elasmobranchii , class of fishes that includes sharks and rays, from comb. form of Greek elasmos "metal plate," from elan "to strike" (see elastic ) + brankhia "gill."

WordNet Word definitions in WordNet
n. any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks; rays; skates [syn: selachian ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Elasmobranch \E*las"mo*branch\, a. (Zo["o]l.) Of or pertaining to the Elasmobranchii. -- n. One of the Elasmobranchii.

Wiktionary Word definitions in Wiktionary
n. Any of many cartilaginous fish of the subclass ''Elasmobranchii''