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
Boxer Imane Khelif admitted to having the SRY gene, located on the Y chromosome, which is found in biological males, and undergoing hormone treatments to lower testosterone levels ahead of the 2024 Olympics in an interview with the French sports publication L'Equipe.
—
Jackson Thompson, FOXNews.com, 6 Feb. 2026
Insights into Alzheimer’s Interestingly, the molecular tricks spiders use to spin their webs are similar to the sophisticated signaling processes found in human neurotransmitter and hormone receptors.
—Mrigakshi Dixit, Interesting Engineering, 6 Feb. 2026
When asked how Atkins could have hit someone with his car without knowing it, Lyons and Haberfeld attributed it to elevated stress hormones.
—Matthew Adams, Fort Worth Star-Telegram, 5 Feb. 2026
As a result, the brain releases more of the hunger hormone ghrelin and dials down leptin, one of the hormones that signals fullness and energy sufficiency.
—Amy J. Sheer, The Conversation, 5 Feb. 2026
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Jackson Thompson, FOXNews.com, 6 Feb. 2026
Insights into Alzheimer’s Interestingly, the molecular tricks spiders use to spin their webs are similar to the sophisticated signaling processes found in human neurotransmitter and hormone receptors.
—Mrigakshi Dixit, Interesting Engineering, 6 Feb. 2026
When asked how Atkins could have hit someone with his car without knowing it, Lyons and Haberfeld attributed it to elevated stress hormones.
—Matthew Adams, Fort Worth Star-Telegram, 5 Feb. 2026
As a result, the brain releases more of the hunger hormone ghrelin and dials down leptin, one of the hormones that signals fullness and energy sufficiency.
—Amy J. Sheer, The Conversation, 5 Feb. 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 15 Feb. 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?
Merriam-Webster unabridged
