melatonin
noun
mel·a·to·nin
ˌme-lə-ˈtō-nən 
: a vertebrate hormone that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation of circadian rhythms
Examples of melatonin in a Sentence
Recent Examples on the Web
Eating foods rich in melatonin increases melatonin in the body.
—
Amy Brownstein, Ms, Rdn, Verywell Health, 10 July 2024
When someone inhales an essential oil, serotonin and melatonin production increase, explains Nilda Agnes Abellera, MD, an integrative and functional medicine physician and medical director of Infuze MD.
—Sherri Gordon, Health, 9 July 2024
Manchester police didn’t disclose how many children were affected, or how much melatonin was ingested.
—Muri Assunção, New York Daily News, 17 May 2024
Bright and blue light (both of which are often found in overhead lighting) can inhibit melatonin production and keep us awake longer.
—Halee Miller, Better Homes & Gardens, 25 June 2024
See all Example Sentences for melatonin 
Amy Brownstein, Ms, Rdn, Verywell Health, 10 July 2024
When someone inhales an essential oil, serotonin and melatonin production increase, explains Nilda Agnes Abellera, MD, an integrative and functional medicine physician and medical director of Infuze MD.
—Sherri Gordon, Health, 9 July 2024
Manchester police didn’t disclose how many children were affected, or how much melatonin was ingested.
—Muri Assunção, New York Daily News, 17 May 2024
Bright and blue light (both of which are often found in overhead lighting) can inhibit melatonin production and keep us awake longer.
—Halee Miller, Better Homes & Gardens, 25 June 2024
See all Example Sentences for melatonin
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'melatonin.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Dictionary Entries Near melatonin
Cite this Entry
“Melatonin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/melatonin. Accessed 15 Jul. 2024.
Copy CitationKids Definition
melatonin
noun
mel·a·to·nin
ˌmel-ə-ˈtō-nən
: a hormone that is secreted by the pineal gland especially in response to darkness and has been linked to the regulation of bodily functions or activities (as sleep) that occur in approximately 24 hour cycles
Medical Definition
melatonin
noun
mel·a·to·nin
ˌmel-ə-ˈtō-nən
: a vertebrate hormone C13H16N2O2 that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation of circadian rhythms
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