Definition of melancholia noun from the Oxford Advanced Learner's Dictionary

 

melancholia

 noun
noun
BrE BrE//ˌmelənˈkəʊliə//
 
; NAmE NAmE//ˌmelənˈkoʊliə//
 
(old-fashioned) Mental and emotional problems
 
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a mental illness in which the patient is depressed and worried by unnecessary fears See related entries: Mental and emotional problems Word Origin late Middle English (denoting black bile): from late Latinfrom Greek melankholia, from melas, melan- ‘black’ + kholē ‘bile’, an excess of which was formerly believed to cause depression.
See the Oxford Advanced American Dictionary entry: melancholia