/ Dictionary / Index R Rapidan: Meaning and Definition of Find definitions for: Rap•i•dan Pronunciation: (rap"i-dan'), [key] — n. a river in N Virginia, flowing E from the Blue Ridge Mountains into the Rappahannock River: Civil War battle 1862. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rapid Rapid City Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language