Melancholia
Pronunciation : Mel`an*cho"li*a
Part of Speech : n.
Etymology : [L. See Melancholy.] (Med.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder