Breadcrumb Home > Dictionary > Index R r.f.b.: Meaning and Definition of Find definitions for: r.f.b. Pronunciation: [key] — Football. Football. right fullback. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. R factor RFC ✖ Related Content Daily Word Quiz: derogate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language