/ Dictionary / Index R rummer: Meaning and Definition of Find definitions for: rum•mer Pronunciation: (rum'ur), [key] — n. a large drinking glass or cup. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rummer (Thesaurus) rummage sale rummy Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language