Rhadamanthus Syllabification: (Rhad·a·man·thus)Pronunciation: /ˌradəˈmanTHəs/ Greek MythologyDefinition of Rhadamanthus the son of Zeus and Europa, and brother of Minos, who, as a ruler and judge in the underworld, was renowned for his justice. Rhadamanthus in other Oxford dictionaries Definition of Rhadamanthus in the British & World English dictionary