Definitions of Melatonin [ˌmɛl əˈtoʊ nɪn]

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Definition of 'Melatonin'

Random House Webster's College Dictionary

1. (n.) melatonin
a hormone secreted by the pineal gland in inverse proportion to the amount of light received by the retina, important in regulating biorhythms.

Etymology: (1955–60; < Gk mélā(s) black +tone+ -in¹)

Definition of 'Melatonin'

Princeton's WordNet

1. (noun) melatonin
hormone secreted by the pineal gland

Definition of 'Melatonin'

U.S. National Library of Medicine

1. Melatonin
A biogenic amine that is found in animals and plants. In mammals, melatonin is produced by the PINEAL GLAND. Its secretion increases in darkness and decreases during exposure to light. Melatonin is implicated in the regulation of SLEEP, mood, and REPRODUCTION. Melatonin is also an effective antioxidant.

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