melatonin Definition in the Cambridge English Dictionary
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Definition of “melatonin” - English Dictionary

Definition of "melatonin" - British English Dictionary

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melatoninnoun [U]

uk   /mel.əˈtəʊ.nɪn/  us   /-ˈtoʊ-/ specialized
a hormone in the ​body that ​produceschanges in ​skincolour and is ​involved in ​controlling biorhythms such as ​oursleeppattern
(Definition of melatonin from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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