What does insulin mean?
Insulin is a hormone produced by specialized cells in the pancreas that helps the body regulate blood glucose. It signals tissues to take up glucose from the bloodstream and encourages the conversion of excess glucose into forms that can be stored, chiefly glycogen and fat. Insulin is essential for normal metabolism, and inadequate production or ineffective use of it can lead to diabetes. The word also denotes medicines made from insulin or similar compounds, which are used to help people with diabetes maintain safe blood glucose levels. In ordinary medical language, “insulin” can therefore refer either to the natural hormone or to treatment. Common expressions include “insulin injection,” “insulin therapy,” and “insulin resistance.” The word is also memorable for its history: it was named from the Latin for “island,” referring to the pancreatic cell clusters in which it is produced.
A hormone produced by the pancreas that helps regulate blood glucose by promoting its uptake and storage by the body.
"Insulin levels rise when the digestive system absorbs glucose from food."
A medicinal preparation of insulin or a similar substance used to help manage diabetes.
"The patient uses insulin to maintain healthy blood glucose levels."
Insulin is normally used as an uncountable noun. The plural “insulins” is uncommon but can refer to distinct insulin preparations or types.
"The study compared several insulins used in diabetes treatment."
The name insulin comes from the tiny pancreatic islands that produce it—its first name is a map of the body.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does insulin come from?
The word insulin was formed in the early 20th century from the Latin insula, meaning “island.” It was named for the islets of Langerhans, the clusters of cells in the pancreas that manufacture the hormone. Its name is related to English words such as island, peninsula, insulate, and insular, all of which derive from the same Latin source.
Related word forms
How insulin is actually used
In medical and general contexts, “insulin” commonly refers both to the naturally occurring hormone and to its medicinal preparations. The uncountable form is standard when referring to the hormone or treatment in general.
Easily confused with insulin
Insulin is a hormone and medicine that regulates blood glucose, whereas insulate means to protect something from heat, cold, sound, or electrical current.