1. Greek mythology: beings that live in trees. Hamadryads are born bonded to a specific tree. It is believed that hamadryads are the actual tree, whilst dryads are the entities or spirits of the trees. If the tree died, the hamadryad associated with it died along with it.
2. another name for the King Cobra.
Etymology: from Latin Hamādryas, from Greek Hamadruas, from hama, “together with” + drus, “tree”.