Etymology
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beast (n.)

c. 1200, beste, "one of the lower animals" (opposed to man), especially "a four-footed animal," also "a marvelous creature, a monster" (mermaids, werewolves, lamia, satyrs, the beast of the Apocalypse), "a brutish or stupid man," from Old French beste "animal, wild beast," figuratively "fool, idiot" (11c., Modern French bête), from Vulgar Latin *besta, from Latin bestia "beast, wild animal," which is of unknown origin.

Used in Middle English to translate Latin animal. Replaced Old English deor (see deer) as the generic word for "wild creature," only to be ousted 16c. by animal.

updated on April 25, 2017

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Definitions of beast from WordNet

beast (n.)
a living organism characterized by voluntary movement;
Synonyms: animal / animate being / brute / creature / fauna
beast (n.)
a cruelly rapacious person;
Synonyms: wolf / savage / brute / wildcat
From wordnet.princeton.edu, not affiliated with etymonline.