Definition of melatonin in English:

melatonin

Syllabification: mel·a·to·nin
Pronunciation: /ˌmeləˈtōnən
 
/

noun

Biochemistry
A hormone secreted by the pineal gland that inhibits melanin formation and is thought to be concerned with regulating the reproductive cycle.
More example sentences
  • The pineal gland hormone, melatonin, is one of the endproducts regulated by the circadian system.
  • Delaying sleep on weekends delays the nightly secretion of melatonin, the sleep hormone.
  • Research has found the pineal hormone melatonin is low in migraine patients.

Origin

1950s: from Greek melas 'black' + (sero)tonin.

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