eagle ray

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

• noun Any of various rays of the family Myliobatidae of tropical and subtropical seas, having platelike teeth used for crushing mollusks and large winglike pectoral fins, which they flap for propulsion.

from The Century Dictionary.

• noun A large species of ray, Myliobatis aquila, a batoid fish of the family Myliobatidæ, found in the Atlantic.
• noun Any ray of the family Myliobatidæ.

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

• noun powerful free-swimming tropical ray noted for `soaring' by flapping winglike fins; usually harmless but has venomous tissue near base of the tail as in stingrays