/ Dictionary / Index R Rough Riders: Meaning and Definition of Find definitions for: Rough' Rid'ers Pronunciation: [key] the members of a volunteer regiment of cavalry organized by Theodore Roosevelt and Leonard Wood for service in the Spanish-American War. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: roughriders (Thesaurus) roughrider rough-sawn Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language