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Word of the Day Wednesday, June 10, 2026

melatonin

/mɛləˈtoʊnɪn/ noun · British & US
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What does melatonin mean?

noun

A hormone produced by the pineal gland that regulates sleep-wake cycles. It is often taken as a dietary supplement to help with sleep disorders.

Example

"The doctor prescribed melatonin to help the patient adjust to a new sleep schedule."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for melatonin

Antonyms of melatonin

Rhymes with melatonin

Etymologically related