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melatonin (n.)

chemical formed in the pineal gland of mammals that regulates certain physiological activities, 1958, from Greek melas "black, dark" (see melano-) + ending from serotonin. So called because its secretion is inhibited by sunlight, or because it changes the skin color of certain reptiles and amphibians.

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Definitions of melatonin

melatonin (n.)
hormone secreted by the pineal gland;
From wordnet.princeton.edu