Pineal gland Meaning, Definition & Usage

  1. noun a small endocrine gland in the brain; situated beneath the back part of the corpus callosum; secretes melatonin
    epiphysis cerebri; pineal body; epiphysis.

WordNet

Definitions
  1. (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.

Webster 1913