/ Dictionary / Index M mongolism: Meaning and Definition of Find definitions for: mon•gol•ism Pronunciation: (mong'gu-liz"um, mon'-), [key] — n. Pathol. (no longer in technical use) Down syndrome. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mongolism (Thesaurus) Mongolic Mongoloid Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language