On"a*ger (?), n.; pl. L. Onagri (#), E. Onagers (#). [L. onager, onagrus, Gr. .]
1. Rom.Antiq.
A military engine acting like a sling, which threw stones from a bag or wooden bucket, and was operated by machinery.
Fairholt.
2. Zool.
A wild ass, especially the koulan.
© Webster 1913.