a former federal union of 15 constituent republics, in E Europe and W and N Asia, comprising the larger part of the former Russian Empire: dissolved in December 1991. 8,650,069 sq. mi. (22,402,200 sq. km). Cap.: Moscow. Also called Russia, Soviet Union . Abbr.: U.S.S.R., USSR
UNION OF SOVIET SOCIALIST REPUBLICS
Meaning of UNION OF SOVIET SOCIALIST REPUBLICS in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012