Hades Syllabification: (Ha·des)Pronunciation: /ˈhādēz/ Greek MythologyDefinition of Hades the underworld; the abode of the spirits of the dead. the god of the underworld, one of the sons of Cronus. Roman equivalent Pluto.Derivatives HadeanPronunciation: /ˈhādēən/ adjective Origin:from Greek Haidēs, of unknown originHades in other Oxford dictionaries Definition of Hades in the British & World English dictionary