In the context of Greek mythology, a dryad is a spirit or nymph associated specifically with the oak tree. The term is derived from the Greek word drys, which translates directly to tree or oak, reflecting the ancient belief that these entities were intrinsically linked to the life force of the forest.
Over time, the usage of the term has evolved significantly. While originally restricted to oak-dwelling spirits, it is now frequently employed as a general classification for any tree nymph found in mythological traditions, representing the broader personification of nature and woodland environments.