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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And in 2023, out-of-pocket insulin costs were capped at $35 a month.
—
Berkeley Lovelace Jr, NBC news, 25 Dec. 2025
Consuming pomegranate has been found to lower insulin and blood sugar levels.
—Carrie Madormo, Verywell Health, 23 Dec. 2025
Better alignment of these genes can improve nutrient processing and how cells respond to insulin, the researchers concluded.
—Khloe Quill, FOXNews.com, 22 Dec. 2025
Disruption of the kidneys’ renin-angiotensin system—named for the hormones involved, which regulate blood pressure—also interferes with insulin signaling.
—Jyoti Madhusoodanan, Scientific American, 16 Dec. 2025
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Berkeley Lovelace Jr, NBC news, 25 Dec. 2025
Consuming pomegranate has been found to lower insulin and blood sugar levels.
—Carrie Madormo, Verywell Health, 23 Dec. 2025
Better alignment of these genes can improve nutrient processing and how cells respond to insulin, the researchers concluded.
—Khloe Quill, FOXNews.com, 22 Dec. 2025
Disruption of the kidneys’ renin-angiotensin system—named for the hormones involved, which regulate blood pressure—also interferes with insulin signaling.
—Jyoti Madhusoodanan, Scientific American, 16 Dec. 2025
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 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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