melatonin

noun
mel·a·to·nin | \ˌme-lə-ˈtō-nən \

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

The rate of children taking alternative or herbal supplements nearly doubled, to 6.3% from 3.7%, over a decade, fueled by melatonin and fish-oil supplements. Sumathi Reddy, WSJ, "Do Dietary Supplements Help or Hurt Children?," 2 July 2018 The American Academy of Sleep Medicine also recommends taking melatonin. Nicole Defeudis, BostonGlobe.com, "Uplift app says it can deliver a natural remedy to jet lag," 11 Apr. 2018 Brainard: My research in the 1980s showed that the effect of light on melatonin secretion has clinical benefits. Jessica Schmerler, Scientific American, "Q&A: Why Is Blue Light before Bedtime Bad for Sleep?," 1 Sep. 2015 Studies suggest that melatonin, which our bodies release in tiny amounts near bedtime, can help when taken in the afternoon before going east or in the morning before heading west. Emily Sohn, Washington Post, "Time-zone changes can leave people worried about jet lag," 7 July 2018 For example: Finley wears sunglasses in bed designed to filter out the blue light from cellphones and create more melatonin, providing a deeper and cleaner sleep. Paul Myerberg, USA TODAY, "Unique path has North Carolina State QB Ryan Finley ready for what comes next," 22 June 2018 Electronics, which inhibit production of the sleep-inducing hormone melatonin, should be turned off at least a half hour before bedtime. Rachel Spector, Msw, miamiherald, "Here's how to chase away your child's scary dreams | Miami Herald," 25 May 2018 Some experts say supplements like omega-3 and melatonin aren’t harmful but have no evident benefit for children. Sumathi Reddy, WSJ, "Do Dietary Supplements Help or Hurt Children?," 2 July 2018 Now The 10-Step Skincare Routine That'll Change Your Face Forever Medicate, but carefully The pharmaceutical world may be able to accommodate your in-flight needs with prescription sleeping pills or even over-the-counter melatonin. Natalie B. Compton, GQ, "How to Successfully Sleep on a Plane," 12 Mar. 2018

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

Greek melas black + -tonin (as in serotonin)

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Last Updated

14 Sep 2018

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The first known use of melatonin was in 1958

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More Definitions for melatonin

melatonin

noun
mel·a·to·nin | \ˌmel-ə-ˈtō-nən \

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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