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melatonin

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mel⋅a⋅to⋅nin

  [mel-uh-toh-nin]
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–noun Physiology.
a hormone secreted by the pineal gland in inverse proportion to the amount of light received by the retina, important in the regulation of biorhythms: in amphibians, it causes a lightening of the skin.
Origin:
1955–60; < Gk mélā(s) black + tone + -in 2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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mel·a·to·nin   (měl'ə-tō'nĭn)   
n.  A hormone derived from serotonin and produced by the pineal gland that stimulates color change in the epidermis of amphibians and reptiles and plays a role in sleep, aging, and reproduction in mammals.

[Greek melās, black + ton(e) + -in.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

melatonin 
1958, from Gk. melas "black" + (sero)tonin. So called because its secretion is inhibited by sunlight.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: mel·a·to·nin
Pronunciation: "mel-&-'tO-n&n
Function: noun
: a vertebrate hormoneC13H16N2O2 that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation ofcircadian rhythms
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

melatonin mel·a·to·nin (měl'ə-tō'nĭn)
n.
A hormone derived from serotonin and produced by the pineal gland that stimulates color change in the epidermis of amphibians and reptiles and that is believed to influence estrus in mammals.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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