Pronunciation: (byel"ō-rush'u, bel"ō-),[key] —n. 1. Official name, Belarus. Formerly, White Russian Soviet Socialist Republic,Byelorus'sian So'viet So'cialist Repub'lic. a republic in E Europe, N of Ukraine: formerly a part of the Soviet Union. 10,200,000; 80,154 sq. mi. (207,600 sq. km). Cap.: Minsk.
2. a region in the W part of former czarist Russia. Also,Belorussia.Also called White Russia.