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
Production of hormones, which are chemical messengers that affect behavior and body processes.
—
Leigh Weddle, Verywell Health, 11 Nov. 2025
An earlier version of this story mistakenly described micronized progesterone as a bioidentical hormone with a molecular structure identical to the estrogen produced in the ovaries.
—Allison Aubrey, NPR, 11 Nov. 2025
Research suggests that movement helps to regulate circadian rhythm and increases melatonin production, which is a hormone that increases at night and promotes sleep.
—Olivia Lee, Charlotte Observer, 10 Nov. 2025
Today’s decision doesn’t cover all hormone replacements, however.
—Tanya Lewis, Scientific American, 10 Nov. 2025
See All Example Sentences for hormone
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Leigh Weddle, Verywell Health, 11 Nov. 2025
An earlier version of this story mistakenly described micronized progesterone as a bioidentical hormone with a molecular structure identical to the estrogen produced in the ovaries.
—Allison Aubrey, NPR, 11 Nov. 2025
Research suggests that movement helps to regulate circadian rhythm and increases melatonin production, which is a hormone that increases at night and promotes sleep.
—Olivia Lee, Charlotte Observer, 10 Nov. 2025
Today’s decision doesn’t cover all hormone replacements, however.
—Tanya Lewis, Scientific American, 10 Nov. 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 16 Nov. 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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