melatonin

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Pronunciation

/ˌmɛləˈtəʊnɪn/

See all 4 pronunciations

/ˌmɛləˈtəʊnɪn/ · /ˌmɛləˈtoʊnɪn/ · /ˌmeləˈtəʉnɪn/ · /ˌmeləˈtɐʉnən/

Definition of melatonin

2 senses · 1 part of speech · etymology included

noun

(uncountable, usually)A hormone, related to serotonin, that is secreted by the pineal gland, and stimulates colour change in the skin of reptiles, and is involved in the sleep and wake and reproductive cycles in mammals.

“How exactly melatonin relates to sleep is still not understood.”
“Melatonin production can be delayed or arrested by even brief flashes of bright light entering the eye, research has shown.”

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noun

(uncountable, usually)A hormone, related to serotonin, that is secreted by the pineal gland, and stimulates colour change in the skin of reptiles, and is involved in the sleep and wake and reproductive cycles in mammals.

“How exactly melatonin relates to sleep is still not understood.”
“Melatonin production can be delayed or arrested by even brief flashes of bright light entering the eye, research has shown.”
(uncountable, usually)Any material similar in its chemistry and effect to the natural hormone.

Definitions from Wiktionary, CC BY-SA.

From mela- + tone + -in, ultimately from Ancient Greek μέλας (mélas, “black, dark”).

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