Pineal

a.
  1. Of or pertaining to a pine cone; resembling a pine cone.
    2. 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.