/ Dictionary / Index U U.S.S.B.: Meaning and Definition of Find definitions for: U.S.S.B. Pronunciation: [key] United States Shipping Board. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. U.S.S. U.S.S.Ct. 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