Entry 1 sense Webster, 1913 Hamadryas /(hȧ*mā"drĭ*ăs)/ · Ha·ma·dry·as · IPA /ˌhæməˈdraɪ.əs/ 01 n. The sacred baboon of Egypt (Cynocephalus Hamadryas). 1. The sacred baboon of Egypt (Cynocephalus Hamadryas).(Zool.)