Etymology
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onager (n.)

Asiatic wild ass, mid-14c., from Latin onager, from Greek onagros, from onos "ass, she-ass" (related to Latin asinus, but the ultimate source is unknown; see ass (n.1)) + agrios "wild," literally "living in the fields," from agros "field" (from PIE root *agro- "field").

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Definitions of onager

onager (n.)
an engine that provided medieval artillery used during sieges; a heavy war engine for hurling large stones and other missiles;
Synonyms: catapult / arbalest / arbalist / ballista / bricole / mangonel / trebuchet / trebucket
onager (n.)
Asiatic wild ass;
Synonyms: Equus hemionus
From wordnet.princeton.edu