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
During perimenopause, the decline in estrogen —which Noble explains as not just a hormone, but a neuroendocrine transmitter that helps the brain stay alert and energized—triggers the brain fog and can affect a variety of cognitive functions depending on the individual.
—
Alexa Mikhail, Flow Space, 14 Oct. 2025
Another experiment found people who used their phone while walking on a treadmill had higher levels of cortisol, a stress hormone, afterward.
—Megan Sauer, CNBC, 14 Oct. 2025
If Damiano or his wife, Toby Milgrome, a pediatrician, didn’t give David injections of the hormone, the baby’s cells could no longer use glucose, a vital energy source.
—Carrie Arnold, Scientific American, 14 Oct. 2025
One of the most severe forms of male infertility is NOA, where a man has a complete lack of sperm in his ejaculate despite having normal hormone levels.
—Mrigakshi Dixit, Interesting Engineering, 13 Oct. 2025
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Alexa Mikhail, Flow Space, 14 Oct. 2025
Another experiment found people who used their phone while walking on a treadmill had higher levels of cortisol, a stress hormone, afterward.
—Megan Sauer, CNBC, 14 Oct. 2025
If Damiano or his wife, Toby Milgrome, a pediatrician, didn’t give David injections of the hormone, the baby’s cells could no longer use glucose, a vital energy source.
—Carrie Arnold, Scientific American, 14 Oct. 2025
One of the most severe forms of male infertility is NOA, where a man has a complete lack of sperm in his ejaculate despite having normal hormone levels.
—Mrigakshi Dixit, Interesting Engineering, 13 Oct. 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 21 Oct. 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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