/ Dictionary / Index H hyperinsulinism: Meaning and Definition of Find definitions for: hy•per•in•su•lin•ism Pronunciation: (hī"pur-in'su-li-niz"um, -ins'yu-), [key] — n. Pathol. excessive insulin in the blood, resulting in hypoglycemia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hyperinflation Hyperion Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language