/ Dictionary / Index M medigap: Meaning and Definition of Find definitions for: med•i•gap Pronunciation: (med'i-gap"), [key] — n. (sometimes cap.) private health insurance that supplements coverage for people already covered by government insurance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Medieval Latin Medill Related Content Daily Word Quiz: ablution Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language