melancholia

Melancholia or melancholy (from Greek: µέλαινα χολή melaina chole, meaning black bile) is a concept found throughout ancient, medieval and premodern medicine in Europe that describes a condition characterized by markedly depressed mood, bodily complaints, and sometimes hallucinations and delusions. Melancholy was regarded as one of the four temperaments matching the four humours. Until the 18th century, doctors and other scholars classified melancholic conditions as such by their perceived common cause – an excess of a notional fluid known as "black bile", which was commonly linked to the spleen. Between the late 18th and late 19th centuries, melancholia was a common medical diagnosis, and modern concepts of depression as a mood disorder eventually arose from this historical context. Related terms used in historical medicine include lugubriousness (from Latin lugere: "to mourn"), moroseness (from Latin morosus: "self-will or fastidious habit"), wistfulness (from a blend of "wishful" and the obsolete English wistly, meaning "intently"), and saturnineness (from Latin Saturninus: "of the planet Saturn). From Wikipedia