"onager : The Asiatic wild ass or hemione (Equus hemionus), an animal of the horse family native to..."

“onager : The Asiatic wild ass or hemione (Equus hemionus), an animal of the horse family native to Asia; specifically, the Persian onager, Persian wild ass, or Persian zebra (Equus hemionus onager).
(military, historical) A military engine acting like a sling which threw stones from a bag or wooden bucket powered by the torsion from a bundle of ropes or sinews operated by machinery; a torsion catapult.”

- https://en.wiktionary.org/wiki/onager#English

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