Onager \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.
[1913 Webster]
2. (Zool.) A wild ass of central Asia, especially the
{koulan} ({Equus hemionus} syn. {Equus hemippus} syn.
{Equus onager}, formely {Asinus onager}).
[1913 Webster +PJC]