Old stone-throwers

• Wild asses of central Asia
• Medieval stone throwers
• Catapults of early warfare, which threw stones
• Ancient catapults
• Wild asses or catapults
• Asses with dorsal stripes
• Wild Asian equines
• Extremely deficient personage trained animals

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Onager \On"a*ger\, n.; pl. L. Onagri , E. Onagers . [L. onager, onagrus, Gr. ?.] (Rom. Antiq.) A military engine acting like a sling, which threw stones from a bag or wooden bucket, and was operated by machinery. --Fairholt. (Zo["o]l.) A wild ass of central ...

Wiktionary Word definitions in Wiktionary
alt. (plural of onager English) n. (plural of onager English)