the world > the supernatural > supernatural being > fairy or elf > [noun] > nature-spirit > inhabiting woods or trees (4)
a spirit or ghost supposed to inhabit an oak tree.
Mythology. A spirit or imaginary being, fabled to dwell in or haunt woods.
A supernatural being connected with nature and fertility, and often viewed as a personification of the woodland or forest.
in fantasy or fiction: (a) persons that live in trees; (b) animated trees.