melatonin

noun
mel·​a·​to·​nin | \ ˌme-lə-ˈtō-nən How to pronounce melatonin (audio) \

Definition of melatonin

: 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 Trump also has been taking zinc, vitamin D, famotidine, melatonin and a daily aspirin, according to the authorized physician statement. Chronicle Staff, SFChronicle.com, "Coronavirus news from the Bay Area: Oct. 2-8," 16 Oct. 2020 According to a letter from the White House, the president received an eight gram dose of Regeneron's polyclonal antibody cocktail, and has been taking zinc, vitamin D, famotidine, melatonin, and daily aspirin. Elizabeth Gulino, refinery29.com, "Trump Appears To Struggle To Breathe In New Video. What Does That Mean?," 6 Oct. 2020 Food and drinks that contain certain minerals, therapeutic herbs and tryptophan — an essential amino acid — can aid your body's production of serotonin and melatonin. Kristen Rogers, CNN, "Tea, milk and other drinks to help you sleep (and some that will hurt)," 11 Aug. 2020 The president also has been taking zinc, vitamin D, famotidine, melatonin and a daily aspirin, Conley said. David Jackson, USA TODAY, "President Trump heading to Walter Reed hospital hours after COVID-19 diagnosis," 3 Oct. 2020 For instance, nuts and kiwis are good sources of melatonin and serotonin, which are important hormones that regulate sleep, according to Dr. Matthew Schmitt, a specialist in sleep medicine at Piedmont Healthcare. Kathryn Vasel, CNN, "Herb gardens for everyone! How to keep the fun alive for remote workers," 20 Aug. 2020 Some of us might be fine watching them right before bed without any decrease of our melatonin production or impact on our sleep overall. Elissa Strauss, CNN, "How to sleep better — kids and grown-ups alike," 15 Sep. 2020 Vitamins, weight-loss pills, melatonin and other dietary supplements are not required to go through the FDA drug testing review process to be sold. Heather Murphy New York Times, Star Tribune, "Doctors warn that oleandrin, touted by Trump, is deadly plant chemical," 27 Aug. 2020 Tart Montgomery cherries have been reported to contain high levels of melatonin. Kristen Rogers, CNN, "Tea, milk and other drinks to help you sleep (and some that will hurt)," 11 Aug. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'melatonin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of melatonin

1958, in the meaning defined above

History and Etymology for melatonin

mela-, extracted from Greek melan-, mélās "black, dark" + -tonin (in serotonin); so named because the hormone can lighten skin color in animals by reversing the effect of melanocyte-stimulating hormones — more at melano-

Note: The word was probably introduced in the first published description of the hormone's isolation: Aaron B. Lerner, et al., "Isolation of melatonin, the pineal gland factor that lightens melanocytes," Journal of the American Chemical Society, vol. 80, no. 10 (May 20, 1958), p. 2587.

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The first known use of melatonin was in 1958

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Last Updated

21 Oct 2020

Cite this Entry

“Melatonin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/melatonin. Accessed 24 Nov. 2020.

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More Definitions for melatonin

melatonin

noun
mel·​a·​to·​nin | \ ˌmel-ə-ˈtō-nən How to pronounce melatonin (audio) \

Medical Definition of melatonin

: 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

More from Merriam-Webster on melatonin

Britannica.com: Encyclopedia article about melatonin

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