Sydenham's chorea Syllabification: (Sy·den·ham's cho·rea)Pronunciation: /ˈsidnəmz kôˈrēə/Definition of Sydenham's chorea noun a form of chorea chiefly affecting children, associated with rheumatic fever. Formerly called St. Vitus's dance.Sydenham's chorea in other Oxford dictionaries Definition of Sydenham's chorea in the British & World English dictionary