[hahy-per-in-suh-li-niz-uhm, -ins-yuh-]
noun Pathology.
excessive insulin in the blood, resulting in hypoglycemia.

1920–25; hyper- + insulin + -ism

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World English Dictionary
hyperinsulinism (ˌhaɪpərˈɪnsjʊlɪˌnɪzəm)
pathol See insulin reaction an excessive amount of insulin in the blood, producing hypoglycaemia, caused by oversecretion of insulin by the pancreas or overdosage of insulin in treating diabetes

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American Heritage
Medical Dictionary

hyperinsulinism hy·per·in·su·lin·ism (hī'pər-ĭn'sə-lə-nĭz'əm)
A condition marked by excessive secretion of insulin by the islets of Langerhans, resulting in hypoglycemia; the symptoms are similar to those of insulin shock, though more chronic in character.

The American Heritage® Stedman's Medical Dictionary
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