Maniacal-depressive insanity
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A form of insanity characterized by alternating periods of high maniacal excitement and of depressed and stuprous conditions in the nature of or resembling melancholia, often occurring as a series or cycle of isolated attacks, with more or less complete restoration to health in the intervals. (Kraepeiin.) This is otherwise called "circular insanity" or "circular stupor."
Defined under Insanity in Black's Law Dictionary.