isles of Langerhans
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|Noun||1.||isles of Langerhans - cell clusters in the pancreas that form the endocrine part of that organ; secrete insulin and other hormones|
ductless gland, endocrine gland, endocrine - any of the glands of the endocrine system that secrete hormones directly into the bloodstream
pancreas - a large elongated exocrine gland located behind the stomach; secretes pancreatic juice and insulin