Pī-nē'al or Pīn'e-al, a.

a. [Fr. pinéal, from Lat. pinea, the cone of a pine, from pineus, of the pine, from pinus, a pine.] Pertaining to, or resembling in form, a pine-cone or pine-apple.

Pineal gland (Anat.), a small conical mass of gray, nervous matter, attached to the floor of the third ventricle of the brain, in front of the cerebellum. It often contains mineral concretions. It was at one time fancifully supposed to be the seat of the soul.