Lewis Short
pȳgargus (noun M) = πύγαργος: (whiterump).
* A kind of eagle, perh. the bald eagle or fish-hawk, Plin. 10, 3, 3, § 7.
* A kind of antelope, Plin. 8, 53, 79, § 214; Juv. 11, 138; Vulg. Deut. 14, 5.
Charlton T. Lewis, Charles Short, A Latin Dictionary