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
2

Examples of hormone in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Lilly tested different combinations of its blockbuster GLP-1 drug Zepbound with eloralintide, a candidate that targets the amylin hormone, in people with obesity and type 2 diabetes. — Ed Silverman, STAT, 1 Oct. 2026 And particularly teenagers, that hormone bloom of identity and growth and reevaluation does nothing but cause potential destruction in your life. — Louis Peitzman, Vulture, 1 Oct. 2026 The Science Behind The Concept Research indicates that music reduces cortisol levels​, the stress hormone that impairs decision-making and dampens focus. — Roy Ward, Forbes.com, 1 Oct. 2026 Risinger added that Lilly’s combination therapy can also serve as an alternative to the company’s other next-generation obesity drug that also targets three other gut hormones. — Annika Kim Constantino, CNBC, 30 Sep. 2026 See All Example Sentences for hormone

Word History

Etymology

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

First Known Use

1905, in the meaning defined at sense 1

Time Traveler
The first known use of hormone was in 1905

Browse Nearby Words

Cite this Entry

“Hormone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hormone. Accessed 3 Oct. 2026.

Kids Definition

: a product of living cells that circulates in body fluids (as blood) or sap and produces a specific and often stimulating effect on cells usually at a distance from the place where it is made

Medical Definition

1
a
: 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
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

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