Fidel Castro Ruz fi·del·cast·roruz uncommon noun 1. Cuban socialist leader who overthrew a dictator in 1959 and established a Marxist socialist state in Cuba (born in 1927) SynonymsCastroFidel CastroFidel Castro Ruz Related words Broader terms socialist WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.