Breadcrumb Home > Dictionary > Index U U.S.S.S.: Meaning and Definition of Find definitions for: U.S.S.S. Pronunciation: [key] United States Steamship. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: usss (Thesaurus) U.S.S.R. Ussuri ✖ Related Content Daily Word Quiz: tautology Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language