MELATONIN

melatonin

(noun) hormone secreted by the pineal gland

Source: WordNet® 3.1

Etymology

Noun

melatonin (usually uncountable, plural melatonins)

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

Any material similar in its chemistry and effect to the natural hormone.

Source: Wiktionary

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