stingray

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

• noun Any of various rays chiefly of the family Dasyatidae, having a whiplike tail armed with one or more venomous spines used for defense.

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

• noun any of various large, venomous rays, of the orders Rajiformes and Myliobatiformes, having a barbed, whiplike tail

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

• noun large venomous ray with large barbed spines near the base of a thin whiplike tail capable of inflicting severe wounds