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
But the overall evidence doesn’t consistently show changes in blood sugar or insulin.
—
Morgan Pearson, Verywell Health, 12 Dec. 2025
Although larger studies are needed on the topic, magnesium supplementation may reduce insulin resistance, which is when your cells don't respond well to the hormone insulin and so glucose (sugar) is not taken out of your blood as well.
—Ruth Jessen Hickman, Health, 11 Dec. 2025
Adding to the growing body of research that proves our microbiome is a powerful ally in fighting disease, scientists have found that an easy-to-get nutrient in our food causes our guts to produce powerful insulin-regulating compounds.
—New Atlas, 9 Dec. 2025
Greater muscle mass is associated with better insulin sensitivity and lower diabetes risk, independent of body fat, according to a study published in The Journal of Clinical Endocrinology & Metabolism.
—Dana Santas, CNN Money, 5 Dec. 2025
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Morgan Pearson, Verywell Health, 12 Dec. 2025
Although larger studies are needed on the topic, magnesium supplementation may reduce insulin resistance, which is when your cells don't respond well to the hormone insulin and so glucose (sugar) is not taken out of your blood as well.
—Ruth Jessen Hickman, Health, 11 Dec. 2025
Adding to the growing body of research that proves our microbiome is a powerful ally in fighting disease, scientists have found that an easy-to-get nutrient in our food causes our guts to produce powerful insulin-regulating compounds.
—New Atlas, 9 Dec. 2025
Greater muscle mass is associated with better insulin sensitivity and lower diabetes risk, independent of body fat, according to a study published in The Journal of Clinical Endocrinology & Metabolism.
—Dana Santas, CNN Money, 5 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 16 Dec. 2025.
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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