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
The condition leads to hormone depletion in both men and women, but in women that loss of estrogen means disrupted menstrual cycles, loss of immune system function, weaker bones, and of course, negative effects on performance for all.
—
Starre Vartan, CNN Money, 16 Dec. 2025
Bowden is investigating the hormones and other molecules that might turn differences of a few degrees into ovaries or testes.
—Elizabeth Preston, Scientific American, 16 Dec. 2025
Addyi works on neurotransmitters in the brain, including dopamine and serotonin, rather than directly on hormones.
—Emily Cegielski, Flow Space, 16 Dec. 2025
This means the cows must be fed 100% organic feed, have access to pasture, and cannot be given synthetic hormones or routine antibiotics.
—Lindsey Desoto, Health, 15 Dec. 2025
See All Example Sentences for hormone
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Starre Vartan, CNN Money, 16 Dec. 2025
Bowden is investigating the hormones and other molecules that might turn differences of a few degrees into ovaries or testes.
—Elizabeth Preston, Scientific American, 16 Dec. 2025
Addyi works on neurotransmitters in the brain, including dopamine and serotonin, rather than directly on hormones.
—Emily Cegielski, Flow Space, 16 Dec. 2025
This means the cows must be fed 100% organic feed, have access to pasture, and cannot be given synthetic hormones or routine antibiotics.
—Lindsey Desoto, Health, 15 Dec. 2025
See All Example Sentences for hormone
Cite this Entry
“Hormone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hormone. Accessed 18 Dec. 2025.
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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