Definition of "pineal gland" []

• A small, cone-shaped organ in the brain of most vertebrates that secretes the hormone melatonin. Also called epiphysis, pineal body, pineal organ. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Our conclusions from these experiments were that Geller was right in suggesting that darkness induces alcohol consumption in rats, and that the pineal gland plays a major role in this darkness-induced alcohol preference."
• "Synthesized from the amino acid tryptophan, melatonin is produced in the pineal gland which Descartes thought was the seat of the human soul and starts to flow when it gets dark, making you tired, and making you go to sleep."
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