insulin
noun
in·su·lin
ˈin(t)-s(ə-)lən 
: a protein pancreatic hormone secreted by the beta cells of the islets of Langerhans that is essential especially for the metabolism of carbohydrates and the regulation of glucose levels in the blood and that when insufficiently produced results in diabetes mellitus
Examples of insulin in a Sentence
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Those with the condition have to monitor their glucose levels and manually take insulin every day, making backcountry travel out of service more challenging.
—
Madison Dapcevich, Outside, 28 Mar. 2026
Multiple phase 3 clinical trials have shown that the medication reduces A1C as well as daily insulin injections and is safe.
—Emily Kay Votruba, EverydayHealth.com, 27 Mar. 2026
Collins and Shaheen focused their previous proposal on allowing people with private and employer-based health insurance to buy a month’s supply of insulin at $35 or less.
—Burgess Everett, semafor.com, 25 Mar. 2026
Researchers from Kumamoto University in Japan have announced the development of an insulin pill to help lower blood sugar.
—Angelica Stabile, FOXNews.com, 20 Mar. 2026
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Madison Dapcevich, Outside, 28 Mar. 2026
Multiple phase 3 clinical trials have shown that the medication reduces A1C as well as daily insulin injections and is safe.
—Emily Kay Votruba, EverydayHealth.com, 27 Mar. 2026
Collins and Shaheen focused their previous proposal on allowing people with private and employer-based health insurance to buy a month’s supply of insulin at $35 or less.
—Burgess Everett, semafor.com, 25 Mar. 2026
Researchers from Kumamoto University in Japan have announced the development of an insulin pill to help lower blood sugar.
—Angelica Stabile, FOXNews.com, 20 Mar. 2026
See All Example Sentences for insulin
Cite this Entry
“Insulin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/insulin. Accessed 1 Apr. 2026.
Copy CitationKids Definition
insulin
noun
in·su·lin
ˈin(t)-s(ə-)lən
: a hormone that is produced by the pancreas and is necessary for the normal use of glucose by the body
Medical Definition
insulin
noun
in·su·lin
ˈin(t)-s(ə-)lən
: a protein hormone that is synthesized in the pancreas from proinsulin and secreted by the beta cells of the islets of Langerhans, that is essential for the metabolism of carbohydrates, lipids, and proteins, that regulates blood sugar levels by facilitating the uptake of glucose into tissues, by promoting its conversion into glycogen, fatty acids, and triglycerides, and by reducing the release of glucose from the liver, and that when produced in insufficient quantities results in diabetes mellitus see iletin
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