hor·​mone | \ ˈhȯr-ˌmōn How to pronounce hormone (audio) \

Definition of hormone

1 : a product of living cells that circulates in body fluids (such as blood) or sap and produces a specific often stimulatory effect on the activity of cells usually remote from its point of origin also : a synthetic substance that acts like a hormone

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Other Words from hormone

hormonelike \ ˈhȯr-​ˌmōn-​ˌlīk How to pronounce hormonelike (audio) \ adjective

Examples of hormone in a Sentence

Recent Examples on the Web

Melatonin is a hormone produced naturally in our brains every day, regulating wakefulness as levels go up at night time and gradually go down early in the morning. Caroline Picard, Good Housekeeping, "What You Need to Know About OTC Sleep Aids, According to Neurologists," 30 Jan. 2019 Numerous media reports have highlighted horror stories of unwanted pregnancies after users were seduced by the idea of a hormone and latex-free contraceptive. Beth Mole, Ars Technica, "“Natural” birth-control app dogged by unwanted pregnancies gets FDA approval," 15 Aug. 2018 Glucose stimulates release of insulin, a hormone that regulates blood sugar levels. Eunice Zhang, Washington Post, "Diet drinks may seem like a good idea, but their effects may surprise you," 3 June 2018 Their résumés would suggest this Trek show would be full of intergalactic hormones and teenage angst à la Wesley Crusher. Darren Orf, Popular Mechanics, "Where Is Star Trek Boldly Going?," 10 Sep. 2018 Stress triggers the release of the hormone cortisol, which encourages your body to store more fat, particularly around your belly. Karyn Repinski, Woman's Day, "New Research Links Belly Fat to an Increased Risk of Heart Attacks in Women," 23 Jan. 2019 Other Medications Likewise, any prescriptions that affect your hormones can disrupt the regularity of your periods. Caroline Picard, Good Housekeeping, "8 Reasons for a Late Period Besides Pregnancy, According to an OB/GYN," 30 Nov. 2018 The veterinarians suspected that the animal’s newfound resistance to insulin might have been caused by Cushing’s disease, an endocrine problem triggered by too much of the stress hormone cortisol. Karen Weintraub, New York Times, "Doctor, Your Patient Is Waiting. It’s a Red Panda.," 29 June 2018 The 40-year-old Georgia resident lives with Cushing’s syndrome, a potentially deadly condition that causes high levels of the hormone cortisol to wreak havoc on a body. Sarah Jane Tribble, Washington Post, "How A Drugmaker Turned The Abortion Pill Into A Rare-Disease Profit Machine," 10 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hormone.' 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 hormone

1905, in the meaning defined at sense 1

History and Etymology for hormone

Greek hormōn, present participle of horman to stir up, from hormē impulse, assault; akin to Greek ornynai to rouse — more at rise

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Statistics for hormone

Last Updated

16 Mar 2019

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Time Traveler for hormone

The first known use of hormone was in 1905

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More Definitions for hormone



English Language Learners Definition of hormone

: a natural substance that is produced in the body and that influences the way the body grows or develops


hor·​mone | \ ˈhȯr-ˌmōn How to pronounce hormone (audio) \

Kids Definition of hormone

: any of various chemical substances produced by body cells and released especially into the blood and having a specific effect on cells or organs of the body usually at a distance from the place of origin


hor·​mone | \ ˈhȯr-ˌmōn How to pronounce hormone (audio) \

Medical Definition of hormone

1a : a product of living cells that circulates in body fluids (as blood) or sap and produces a specific often stimulatory effect on the activity of cells usually a distance from its point of synthesis Some people develop insulin resistance, a condition in which response to the hormone is muted and the body must produce excess insulin to maintain healthy blood-glucose concentrations.— Ben Harder, Science News, 18 May 2002
b : a synthetic substance that acts like a hormone
2 : sex hormone I discovered I had the classic signs of perimenopause, the prelude to “the change” when hormones yo-yo before menstrual periods cease altogether …— Beth Witrogen McLeod, Cooking Light, April 2000

Other Words from hormone

hormonelike \ -​ˌlīk How to pronounce hormonelike (audio) \ adjective

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More from Merriam-Webster on hormone

Rhyming Dictionary: Words that rhyme with hormone

Spanish Central: Translation of hormone

Nglish: Translation of hormone for Spanish Speakers

Britannica English: Translation of hormone for Arabic Speakers

Britannica.com: Encyclopedia article about hormone

Comments on hormone

What made you want to look up hormone? Please tell us where you read or heard it (including the quote, if possible).


grandiloquent, ostentatious, or bombastic

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