/ Dictionary / Index R rubber room: Meaning and Definition of Find definitions for: rub'ber room' Pronunciation: [key] a room padded with foam rubber for the confinement of a violent mentally ill person. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rubber plant rubber stamp Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language