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Word: melatonin (lookup usage) (lookup stats)


Meaning:

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

Source: Wiktionary | Src Info »