pineal gland: Meaning and Definition of

pin'eal gland"

Pronunciation: [key]
  1. a small, cone-shaped endocrine organ in the posterior forebrain, secreting melatonin and involved in biorhythms and gonadal development. Also calledSee diag. under
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.