A dryad is a tree nymph, that is a female spirit of a tree, in Greek mythology. In Greek drys signifies "oak". Thus dryads are specifically the nymphs of oak trees, though the term has come to be used for all tree nymphs in general. They were normally considered to be very shy creatures, except around the goddess Artemis, who was known to be a friend to most nymphs.
The creature was humanoid, but it's body seemed to be made of woven wood. It's eyes were two glowing holes, and it's hair was a thick, elegant carpet of moss. It's hands were branches, leaves included, and it's feet were roots that twisted and dragged the thing along as smoothly as if it were walking.