Noah Webster's Dictionary 1. (n.) A military engine acting like a sling, which threw stones from a bag or wooden bucket, and was operated by machinery. 2. (n.) A wild ass, especially the koulan.

Multi-Version Concordance Onager (1 Occurrence) Job 39:5 Who hath sent out the wild ass free? and who hath loosed the bands of the onager, (DBY)