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
Recent Examples on the Web
Lofton stressed that some foods cause the body to become insulin resistant, which can lead to hunger, brain fog, and mental health issues.
—
Arthur Jones Ii, ABC News, 7 Feb. 2026
Type 2 Diabetes Type 2 diabetes develops when the body becomes resistant to insulin or doesn't produce enough to regulate glucose (blood sugar) levels.
—Lindsay Curtis, Health, 6 Feb. 2026
Key Takeaways Monk fruit and stevia are both natural and calorie-free sweeteners that don't raise blood sugar or insulin secretion.
—Brittany Lubeck, Verywell Health, 6 Feb. 2026
But the process can also lead to more insulin secretion—and drive down weight.
—Bethany Brookshire, Scientific American, 6 Feb. 2026
See All Example Sentences for insulin
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Arthur Jones Ii, ABC News, 7 Feb. 2026
Type 2 Diabetes Type 2 diabetes develops when the body becomes resistant to insulin or doesn't produce enough to regulate glucose (blood sugar) levels.
—Lindsay Curtis, Health, 6 Feb. 2026
Key Takeaways Monk fruit and stevia are both natural and calorie-free sweeteners that don't raise blood sugar or insulin secretion.
—Brittany Lubeck, Verywell Health, 6 Feb. 2026
But the process can also lead to more insulin secretion—and drive down weight.
—Bethany Brookshire, Scientific American, 6 Feb. 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 14 Feb. 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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