Harpy

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

• noun Greek Mythology One of several loathsome, voracious monsters with the head and trunk of a woman and the tail, wings, and talons of a bird.
• noun A predatory person.
• noun A shrewish woman.

from The Century Dictionary.

• noun In Greek myth, a winged monster, ravenous and filthy, having the face and body of a woman and the wings of a bird of prey, with the feet and fingers armed with sharp claws and the face pale with hunger, serving as a minister of divine vengeance, and defiling everything it touched.
• noun Hence A rapacious, grasping person; one who is repulsively greedy and unfeeling.
• noun In ornithology: The harpy-eagle.
• noun An English book-name of the marsh-harrier or moor-buzzard, Circus æruginosus. Also called white - headed harpy.
• noun In mammalogy, a fruit-bat of the genus Harpyia.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Gr. Myth.) A fabulous winged monster, ravenous and filthy, having the face of a woman and the body of a vulture, with long claws, and the face pale with hunger. Some writers mention two, others three.
• noun One who is rapacious or ravenous; an extortioner.
• noun The European moor buzzard or marsh harrier (Circus æruginosus).
• noun A large and powerful, double-crested, short-winged American eagle (Thrasaëtus harpyia). It ranges from Texas to Brazil.
• noun (Zoöl.) A small, insectivorous Indian bat (Harpiocephalus harpia).
• noun (Zoöl.) the house fly.

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

• noun any of various fruit bats of the genus Nyctimene distinguished by nostrils drawn out into diverging tubes
• noun large black-and-white crested eagle of tropical America
• noun a malicious woman with a fierce temper
• noun (Greek mythology) vicious winged monster; often depicted as a bird with the head of a woman