/ Dictionary / Index R Roadrailer: Meaning and Definition of Find definitions for: Road•rail•er Pronunciation: (rōd'rā"lur), [key] — Trademark. Trademark. a combination trailer truck and railroad car with two sets of retractable wheels, one steel, the other rubber, making possible bimodal transportation on rails and highways. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. road racing road roller Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language