melatonin (Noun) A hormone, related to serotonin, that is secreted by the pineal gland , and stimulates colour change in the skin of reptiles, and is involved in the sleep/wake and reproductive cycles in mammals.
melatonin (Noun) Any material similar in its chemistry and effect to the natural hormone.
OmegaWiki DictionaryOmegaWiki DictionaryΩ
melatonin A hormone of formula C13H16N2O2 that regulates the sleep-wake cycles in humans.
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