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pineal gland

a small, cone-shaped endocrine organ in the posterior forebrain, secreting melatonin and involved in biorhythms and gonadal development.
Also called epiphysis.
Origin of pineal gland
1705-15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for pineal gland
Historical Examples
  • Descartes fixed upon the pineal gland, but there were countless other hypotheses as to the position of this point.

    An Introduction to Psychology Wilhelm Max Wundt
  • The mind has no observable natural relation to the pineal gland.

    Theodicy G. W. Leibniz
  • But there was one gland which had not been duplicated in The Brain, the pineal gland.

    The Brain Alexander Blade
  • To the roof of the thalamencephalon is attached a flattened sack (pn) which is probably the pineal gland.

  • "Perhaps you've seen a pineal gland," suggested the disgusted Doctor.

    Sevenoaks J. G. Holland
  • In Mammalia the development of the pineal gland is, according to Mihalkovics, generally similar to that of Birds.

  • Mind, driven from the field of extension, erects its last fortress in the pineal gland.

  • Strings of tiny green bulbs guided the path toward the pineal gland, the citadel of The Brain.

    The Brain Alexander Blade
  • What happened if one plugged some apparatus of the pineal gland into the circuit of the pineal gland?

    The Brain Alexander Blade
  • He grabbed the axe he'd left there and swung it against the nerve-stem where it entered the pineal gland.

    The Brain Alexander Blade
British Dictionary definitions for pineal gland

pineal gland

a pea-sized organ in the brain, situated beneath the posterior part of the corpus callosum, that secretes melatonin into the bloodstream Technical names epiphysis, epiphysis cerebri
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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pineal gland in Medicine

pineal gland n.
See pineal body.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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pineal gland in Science
pineal gland  
A small gland located near the brain and primarily involved in the production and secretion of the hormone melatonin, which regulates circadian rhythms in many animals, including humans.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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