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melatonin: Meaning and Definition of
mel•a•to•nin
Pronunciation: (mel"u-tō'nin), [key]
— n. Physiol.
- a hormone secreted by the pineal gland in inverse proportion to the amount of light received by the retina, important in the regulation of biorhythms: in amphibians, it causes a lightening of the skin.
See also:
- melatonin (Thesaurus)
