hamadryad Syllabification: (ham·a·dry·ad)Pronunciation: /ˌhaməˈdrīəd/Definition of hamadryad noun 1 (also Hamadryad) Greek & Roman Mythology a nymph who lives in a tree and dies when the tree dies. 2another term for king cobra.Origin:via Latin from Greek hamadruas, from hama 'together' + drus 'tree'hamadryad in other Oxford dictionaries Definition of hamadryad in the British & World English dictionary