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
Humans need fat for basic cellular and biological functions in the body—fats, or lipids, are essential for creating cellular membranes, absorbing hormones and vitamins and regulating body temperature.
—
Lauren J. Young, Scientific American, 7 Jan. 2026
Calcium is necessary for muscle contraction, nerve impulse transmission, proper blood vessel function, and hormone secretion.
—Lana Barhum, Verywell Health, 7 Jan. 2026
Without adequate sleep, your body has trouble repairing tissues, regulating hormones and managing energy balance.
—Katia Hetter, CNN Money, 6 Jan. 2026
Experts agreed that alcohol's effects are often compounded by its impact on sleep quality, body fat and metabolic health — all of which are closely tied to hormone levels.
—Deirdre Bardolf, FOXNews.com, 5 Jan. 2026
See All Example Sentences for hormone
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Lauren J. Young, Scientific American, 7 Jan. 2026
Calcium is necessary for muscle contraction, nerve impulse transmission, proper blood vessel function, and hormone secretion.
—Lana Barhum, Verywell Health, 7 Jan. 2026
Without adequate sleep, your body has trouble repairing tissues, regulating hormones and managing energy balance.
—Katia Hetter, CNN Money, 6 Jan. 2026
Experts agreed that alcohol's effects are often compounded by its impact on sleep quality, body fat and metabolic health — all of which are closely tied to hormone levels.
—Deirdre Bardolf, FOXNews.com, 5 Jan. 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 10 Jan. 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?
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