/ Dictionary / Index U USR: Meaning and Definition of Find definitions for: USR Pronunciation: [key] United States Reserves. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. usquebaugh USRC 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