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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New laws included banning law enforcement officers from concealing their identities while on duty, capping out-of-pocket costs for insulin and naming Diwali an official California holiday.
—
Andrew J. Campa, Los Angeles Times, 3 Jan. 2026
Your Insulin Response May Change Artificial sweeteners in diet soda can sometimes cause spikes in insulin (the hormone that regulates blood sugar).
—Md Published, Verywell Health, 2 Jan. 2026
Matcha’s caffeine and EGCG may support weight loss by boosting metabolism, fat oxidation, insulin sensitivity, and appetite control.
—Christina Manian, Health, 2 Jan. 2026
The resulting organoids responded to glucose stimulation by increasing insulin secretion.
—Neetika Walter, Interesting Engineering, 1 Jan. 2026
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Andrew J. Campa, Los Angeles Times, 3 Jan. 2026
Your Insulin Response May Change Artificial sweeteners in diet soda can sometimes cause spikes in insulin (the hormone that regulates blood sugar).
—Md Published, Verywell Health, 2 Jan. 2026
Matcha’s caffeine and EGCG may support weight loss by boosting metabolism, fat oxidation, insulin sensitivity, and appetite control.
—Christina Manian, Health, 2 Jan. 2026
The resulting organoids responded to glucose stimulation by increasing insulin secretion.
—Neetika Walter, Interesting Engineering, 1 Jan. 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 4 Jan. 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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