Webster’s Revised Unabridged Dictionary · 1913
Pygarg
Py′garg, Py·gar′gus, [L. pygargus, Gr. πύγαργος, literally, white rump; πυγή the rump + white: cf. F. pygargue.] 1. (Zoöl.) A quadruped, probably the addax, an antelope having a white rump. Deut. xiv. 5.
2. (Zoöl.) (a) The female of the hen harrier. (b) The sea eagle.