Lexic.us

Definition of Melatonin

1. Noun. Hormone secreted by the pineal gland.

Definition of Melatonin

1. 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 ¹

2. Noun. Any material similar in its chemistry and effect to the natural hormone. ¹

¹ Source: wiktionary.com

Definition of Melatonin

1. [n -S]

Medical Definition of Melatonin

1. A hormone secreted by the pineal gland. In lower vertebrates causes aggregation of pigment in melanophores and thus lightens skin. In humans believed to play a role in establishment of circadian rhythms. (13 Nov 1997)

Lexicographical Neighbors of Melatonin

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