Pygarg \Py"garg\, Pygargus \Py*gar"gus\, [L. pygargus, Gr. ?, literally, white rump; ? the rump + white: cf. F. pygargue.]

1. (Zool.) A quadruped, probably the addax, an antelope having a white rump. --Deut. xiv. 5. [1913 Webster]

2. (Zool.)
   (a) The female of the hen harrier.
   (b) The sea eagle. [1913 Webster]

Source: The Collaborative International Dictionary of English v.0.48
 

Pygarg \Py"garg\, Pygargus \Py*gar"gus\, [L. pygargus, Gr. ?, literally, white rump; ? the rump + white: cf. F. pygargue.]

1. (Zo["o]l.) A quadruped, probably the addax, an antelope having a white rump. --Deut. xiv. 5.

2. (Zo["o]l.)
   (a) The female of the hen harrier.
   (b) The sea eagle.

Source: Webster's Revised Unabridged Dictionary (1913)