Adjective "melatonin" definition and examples

(Melatonin may not be an adjective, but it can be used as an adjective, click here to find out.)



Definitions and examples


A hormone secreted by the pineal gland which inhibits melanin formation and is thought to be concerned with regulating the reproductive cycle.
  1. 'Cherries are also a great source of melatonin, a hormone that your body uses to regulate its sleep patterns.'
  2. 'Research has found the pineal hormone melatonin is low in migraine patients.'

More definitions

1. 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.

More examples(as adjective)

"drops can be melatonin."


1950s: from Greek melas ‘black’ + serotonin.