onager

on·a·ger  (n-jr)

n.

1. A fast-running wild ass (Equus hemionus subsp. onager) of central Asia, having an erect mane and a broad black stripe along its back.

2. An ancient and medieval stone-propelling siege engine.

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[Middle English, from Late Latin, from Latin, wild ass, from Greek onagros : onos, ass + agrios, wild; see agro- in Indo-European roots.]

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onager [ˈɒnədʒə]

n pl -gri [-ˌgraɪ], -gers

1. (Life Sciences & Allied Applications / Animals) a Persian variety of the wild ass, Equus hemionus Compare kiang

2. (Military / Arms & Armour (excluding Firearms)) an ancient war engine for hurling stones

[from Late Latin: military engine for stone throwing, from Latin: wild ass, from Greek onagros, from onos ass + agros field]

Thesaurus

Noun	1.	onager - an engine that provided medieval artillery used during sieges; a heavy war engine for hurling large stones and other missiles arbalest, arbalist, ballista, bricole, mangonel, trebuchet, trebucket, catapult engine - an instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc.; "medieval engines of war"
	2.	onager - Asiatic wild ass                     Equus hemionus wild ass - any of several equine mammals of Asia and northeast Africa chigetai, dziggetai, Equus hemionus hemionus - Mongolian wild ass