Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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U-2 a U.S. aircraft formerly used for surveillance from very high altitudes.
U-boat a German submarine.
U-joint variant of universal joint.
U-turn a smooth, continuous turn by a vehicle involving a change in direction of 180 degrees.
U.S. an abbreviation for United States.
U.S. Open a major annual tennis tournament held in the U.S. in late summer, open to all contestants, amateur and professional.
U.S.A. an abbreviation for United States of America.
U.S.S.R. an abbreviation for "Union of Soviet Socialist Republics," the official name of the former Soviet Union.