any of an order (Torpediniformes) of cartilaginous fishes with special organs that can produce strong electrical discharges used to paralyze or stun its enemies or prey
See electric ray in American Heritage Dictionary 4
noun
Any of various tropical or subtropical marine fishes of the family Torpedinidae, having a rounded body and a pair of organs capable of producing an electric discharge, which is used to stun or kill prey. Also called crampfish, numbfish, torpedo.