A dryad (; , <small>sing.</small> ) is an oak tree nymph or oak tree spirit in Greek mythology; Drys (ôÃÂῦÃÂ) means "tree", and more specifically "oak" in Greek. Today the term is often used to refer to tree nymphs in general.
Most dryads, as nymphs, were supernaturally long-lived, but the lifespan of hamadryad nymphs was bound to an individual tree. Hamadryads were inextricably connected with their trees, such that if the tree died, the hamadryad associated with it also died. For these reasons, dryads and the Greek gods punished any mortal who harmed trees without first the tree-nymphs.
The dryads of the ash tree were called the Meliae. The Meliae sisters tended the infant Zeus in Rhea's Cretan cave. In Hesiod's Theogony, Gaia gave birth to the Meliae after being made fertile by the blood of the castrated Uranus. Daphnaiai were nymphs of the laurel tree.
Some of the individual dryads or hamadryads are: