·noun A kind of mental unsoundness characterized by extreme depression of spirits, ill-grounded fears, delusions, and brooding over one particular subject or train of ideas.
mĕlanchŏlĭa, ae, f., = μελαγχολία, melancholy , Cael. Aur. Acut. 3, 12, 108. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.