From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ogre \O"gre\ ([=o]"g[~e]r), noun [F., fr. Sp. ogro, fr. L. Orcus the god of the infernal regions; also, the lower world, hell.] An imaginary monster, or hideous giant of fairy tales, who lived on human beings; hence, any frightful giant; a cruel monster.
From WordNet (r) 3.0 (2006) [wn]:
The dictionary definitions are retrieved from a local copy of two of the open source DICT dictionaries. Click here for the database copyright information. DEFINE.COM is registered as an educational NONPROFIT corporation. We aim to please around here. We believe in using positive reinforcement to get things done. We make suggestions that are intended to make life more enjoyable. We think about efficiency, automation, security, PRIVACY, social and ecological responsibility and positive HUMANITARIAN ethics and VALUES. We are benevolent. DO NO HARM is our motto.