/ Dictionary / Index M midsole: Meaning and Definition of Find definitions for: mid•sole Pronunciation: (mid'sōl"), [key] — n. a layer of material or cushioning between the outsole and the insole of a shoe. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mid-size midst Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language