Pineal \Pi"ne*al\, a. [L. pinea the cone of a pine, from pineus of the pine, from pinus a pine: cf. F. pin['e]ale.]

Of or pertaining to a pine cone; resembling a pine cone.

Pineal gland (Anat.), a glandlike body in the roof of the third ventricle of the vertebrate brain; -- called also pineal body, epiphysis, conarium. In some animals it is connected with a rudimentary eye, the so-called pineal eye, and in other animals it is supposed to be the remnant of a dorsal median eye.

Source: Webster's Revised Unabridged Dictionary (1913)