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
GLP-1s, which act on the brain and the body's hormones to help suppress hunger and slow digestion, are considered a watershed in Americans' long struggle to address obesity and related diseases.
—
Yuki Noguchi, NPR, 28 Oct. 2025
Control the Lights Melatonin is a hormone that helps to regulate your body's internal circadian clock.
—Dina Roth Port, Parents, 28 Oct. 2025
Regular meal timing can help reinforce the body’s circadian rhythm—the internal 24-hour clock that governs everything from digestion to hormone release.
—Fran Kritz, Health, 28 Oct. 2025
Little things like that create oxytocin the bonding hormone.
—Hannah Sacks, PEOPLE, 28 Oct. 2025
See All Example Sentences for hormone
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Yuki Noguchi, NPR, 28 Oct. 2025
Control the Lights Melatonin is a hormone that helps to regulate your body's internal circadian clock.
—Dina Roth Port, Parents, 28 Oct. 2025
Regular meal timing can help reinforce the body’s circadian rhythm—the internal 24-hour clock that governs everything from digestion to hormone release.
—Fran Kritz, Health, 28 Oct. 2025
Little things like that create oxytocin the bonding hormone.
—Hannah Sacks, PEOPLE, 28 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 29 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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