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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. abbreviation of "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. abbreviation of "United States of America."
U.S.S.R. abbreviation of "Union of Soviet Socialist Republics," the official name of the former "Soviet Union."