excessive insulin in the blood, resulting in hypoglycemia.
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British Dictionary definitions for hyperinsulinism
pathol 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: See insulin reaction
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012