Definition of onager
1 : an Asian wild ass (Equus hemionus onager syn. E. onager) that usually has a broad dorsal stripe and is related to the kiang
2 [Late Latin, from Latin] : a heavy catapult used in ancient and medieval times
Origin of onager
Middle English, wild ass, from Latin, from Greek onagros, from onos ass + agros field — more at acre
First Known Use: 14th century
Learn More about onager
Britannica.com: Encyclopedia article about "onager"
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