a member of the more radical wing of the Russian Social Democratic party that seized power in Russia in 1917 and became the Communist party in 1918
derog a former term for a Communist, esp a Russian Communist
Bolshevik adj
Bolshevism /-viz(ə)m/ noun
Bolshevist noun
[Russian bol'shevik, from bol'she larger; from their forming the majority group of the party]