/ Dictionary / Index F foam rubber: Meaning and Definition of Find definitions for: foam' rub'ber Pronunciation: [key] a light, spongy rubber, used for mattresses, cushions, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. foam glass foamy Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language