cho·re·a 
(kô-rēə, kō-, kə-)
(kô-rēə, kō-, kə-)n.
Any of various disorders of the nervous system marked by involuntary, jerky movements, especially of the arms, legs, and face, and by incoordination.
[New Latin chorēa (Sānctī Vitī), (Saint Vitus') dance, from Latin chorēa, from Greek khoreia, choral dance, from khoros; see CHORUS.]
cho·reic (-ĭk) adj.