electric ray

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various marine cartilaginous fishes of the order Torpediniformes, having a flattened, rounded body and a pair of organs used to produce an electric discharge for stunning prey.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of the group of rays of the order Torpedodiniformes, which can produce an electric discharge.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any sluggish bottom-dwelling ray of the order Torpediniformes having a rounded body and electric organs on each side of the head capable of emitting strong electric discharges