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
Fruits and vegetables are also rich in fiber, vitamins, and antioxidants, which promote better brain, hormone, and gut health, Jansen and Blount added.
—
Megan Margulies, Health, 9 July 2025
Elevated cortisol, your body’s primary stress hormone, can temporarily suppress testosterone production, causing symptoms identical to testosterone deficiency, especially reduced libido and fatigue.
—Dr. Jamin Brahmbhatt, CNN Money, 8 July 2025
Similar to spending time in nature during the day, stargazing can have many positive physical effects, such as lowering blood pressure and cortisol (stress hormone) levels.
—Roger Sands, Forbes.com, 8 July 2025
During this time, the corpus luteum produces progesterone, the key hormone involved in supporting a pregnancy and preparing the uterine lining, until the function of producing progesterone (and estrogen) is taken over by the placenta during pregnancy.
—Laura Dorwart, Verywell Health, 8 July 2025
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Megan Margulies, Health, 9 July 2025
Elevated cortisol, your body’s primary stress hormone, can temporarily suppress testosterone production, causing symptoms identical to testosterone deficiency, especially reduced libido and fatigue.
—Dr. Jamin Brahmbhatt, CNN Money, 8 July 2025
Similar to spending time in nature during the day, stargazing can have many positive physical effects, such as lowering blood pressure and cortisol (stress hormone) levels.
—Roger Sands, Forbes.com, 8 July 2025
During this time, the corpus luteum produces progesterone, the key hormone involved in supporting a pregnancy and preparing the uterine lining, until the function of producing progesterone (and estrogen) is taken over by the placenta during pregnancy.
—Laura Dorwart, Verywell Health, 8 July 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 Jul. 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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