Hamadryad :: Hamadryad (n.) A tree nymph whose life ended with that of the particular tree, usually an oak, which had been her abode..
Hamadryad :: Hamadryad (n.) A large venomous East Indian snake (Orhiophagus bungarus), allied to the cobras..
Hamadryas :: Hamadryas (n.) The sacred baboon of Egypt (Cynocephalus Hamadryas).