pineal body Hear it!

pineal body definition

pineal body

a small, grayish, cone-shaped, glandular outgrowth from the brain of all vertebrates that produces the hormone melatonin: in lower vertebrates, often visible as an external median eye

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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