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
Females of different octopus species may have unique chemical signatures, and males’ receptors may be tuned to respond only to the right blend of hormones.
—
Cody Cottier, Scientific American, 2 Apr. 2026
And the countries of the world that do receive oil through the hormone straight must take care of thatpassage.
—James Powel, USA Today, 2 Apr. 2026
Perimenopause is the transitional phase before menopause when hormones are volatile, which typically starts in one’s early 40s, and for some, even earlier.
—Helen Carefoot, Flow Space, 2 Apr. 2026
During exercise, muscles release the hormone irisin.
—Hadia Zainab, CNN Money, 2 Apr. 2026
See All Example Sentences for hormone
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Cody Cottier, Scientific American, 2 Apr. 2026
And the countries of the world that do receive oil through the hormone straight must take care of thatpassage.
—James Powel, USA Today, 2 Apr. 2026
Perimenopause is the transitional phase before menopause when hormones are volatile, which typically starts in one’s early 40s, and for some, even earlier.
—Helen Carefoot, Flow Space, 2 Apr. 2026
During exercise, muscles release the hormone irisin.
—Hadia Zainab, CNN Money, 2 Apr. 2026
See All Example Sentences for hormone
Cite this Entry
“Hormone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hormone. Accessed 4 Apr. 2026.
Copy CitationKids Definition
hormone
noun
hor·mone
ˈhȯr-ˌmōn 
: 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
hormone
noun
hor·mone
ˈhȯr-ˌmōn
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
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
Beth Witrogen McLeod, Cooking LightLove words? Need even more definitions?
Merriam-Webster unabridged
