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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Pi·ne·al a.  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.
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From: WordNet (r) 2.0

 pineal body
      n : a small endocrine gland in the brain; situated beneath the
          back part of the corpus callosum; secretes melatonin
          [syn: pineal gland, epiphysis cerebri, epiphysis]