insulin

American  

[in-suh-lin, ins-yuh-] / ˈɪn sə lɪn, ˈɪns yə- /

noun

1. Biochemistry. a polypeptide hormone, produced by the beta cells of the islets of Langerhans of the pancreas, that regulates the metabolism of glucose and other nutrients.

2. Pharmacology. any of several commercial preparations of this substance, each of which allows a particular rate of absorption into the system: genetically engineered or obtained from the pig or ox pancreas, and used in the treatment of diabetes to restore the normal ability of the body to utilize sugars and other carbohydrates.

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insulin British  

/ ˈɪnsjʊlɪn /

noun

1. a protein hormone, secreted in the pancreas by the islets of Langerhans, that controls the concentration of glucose in the blood. Insulin deficiency results in diabetes mellitus

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insulin Scientific  

/ ĭn′sə-lĭn /

1. A hormone produced in the pancreas that regulates the amount of sugar in the blood by stimulating cells, especially liver and muscle cells, to absorb and metabolize glucose. Insulin also stimulates the conversion of blood glucose into glycogen and fat, which are the body's chief sources of stored carbohydrates.

2. A drug containing this hormone, obtained from the pancreas of animals or produced synthetically and used to treat diabetes.

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insulin Cultural  

1. A hormone secreted by the pancreas that regulates the levels of sugar in the blood.

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Persons suffering from diabetes mellitus may receive periodic or daily injections of insulin as a treatment for the disease.

Etymology

Origin of insulin

First recorded in 1910–15; insul(a) + -in ²

Explanation

Insulin is a hormone in your body that lowers the amount of glucose in your blood. People with diabetes sometimes need an insulin supplement to help regulate their blood sugar. Your pancreas creates insulin, which allows your body to convert sugars from food into energy. You need insulin in order for that bowl of spaghetti to help fuel the 10K you're running later. Diabetes makes it hard (or impossible) for the body to generate insulin, and access to prescription insulin is essential for a diabetic person to stay alive. The Latin root of insulin means "island," referring to the islets of Langerhans in the pancreas, which secrete the hormone.

Example Sentences

Insulin glargine refers to a long-acting, synthetic analog of human insulin which is used to keep blood sugar levels steady for a full 24 hours.

From The Wall Street Journal • Apr. 16, 2026

"Insulin injections remain a daily burden for many patients," said Associate Professor Shingo Ito.

From Science Daily • Mar. 24, 2026

As Glutality’s sole secured creditor, Insulin Care has priority on any cash recovered during the bankruptcy process.

From Barron's • Mar. 4, 2026

Insulin from cattle and pigs had been used to treat diabetes, but caused allergic reactions in some patients.

From BBC • Sep. 25, 2025

Insulin injections encouraged Woolf to gain weight, and to manage his diabetes he needed to consume regular, high- protein, low-carbohydrate meals—meats were recommended—which also added pounds.

From "Seabiscuit: An American Legend" by Laura Hillenbrand