/ Dictionary / Index M mediumistic: Meaning and Definition of Find definitions for: me•di•um•is•tic Pronunciation: (mē"dē-u-mis'tik), [key] — adj. pertaining to a spiritualistic medium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. medium frequency medium octavo Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language