pineal gland

noun
a small, cone-shaped endocrine organ in the posterior forebrain, secreting melatonin and involved in biorhythms and gonadal development.
Also called epiphysis.


Origin:
1705–15

Dictionary.com Unabridged
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Collins
World English Dictionary
pineal gland or pineal body
 
n
epiphysis, Technical names: epiphysis cerebri a pea-sized organ in the brain, situated beneath the posterior part of the corpus callosum, that secretes melatonin into the bloodstream
 
pineal body or pineal body
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
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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Example sentences
Melatonin secretion by the brain's pineal gland is switched on by darkness.
Melatonin is a hormone produced by the pineal gland that regulates sleep.
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