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pineal gland

noun

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


pineal gland

noun

  1. a pea-sized organ in the brain, situated beneath the posterior part of the corpus callosum, that secretes melatonin into the bloodstream Technical namesepiphysisepiphysis 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

pineal gland

  1. 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.
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Word History and Origins

Origin of pineal gland1

First recorded in 1705–15
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Example Sentences

Melatonin is produced naturally in the pineal gland to signal the body that it is time to sleep and regulate its circadian rhythm -- the physiological cycle over a 24-hour period.

These supplements, including sugary gummies, typically offer much higher doses than what the pineal gland produces to help shift circadian rhythm to night mode.

Melatonin is a naturally occurring hormone produced by the pineal gland, a small structure at the center of the brain.

It inhibits the production of natural signals such as melatonin, a hormone that is produced by the brain's pineal gland as the night arrives and in response to darkness.

From Salon

Melatonin is a naturally occurring hormone produced by the pineal gland that helps regulate the sleep-wake system.

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