Choreic insanity
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
insanity arising from chorea, the latter being a nervous disease, more commonly attacking children than adults, characterized by irregular and involuntary twitch-ings of the muscles of the limbs aud face, popularly called "St. Vitus' dance."
Defined under Pellagrous insanity in Black's Law Dictionary.