/ Dictionary / Index N natural rubber: Meaning and Definition of Find definitions for: nat'ural rub'ber Pronunciation: [key] rubber (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. natural right natural science Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language