a baboon, Papio (Comopithecus) hamadryas, of Ethiopia, the male of which has a mantle of long, dark hair about the head and shoulders: held sacred by the ancient Egyptians.
Origin of hamadryas baboon
1930–35; < New Latin hamadryas the specific epithet (see hamadryad)
Also called sacred baboon.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019