One of the mysteries of the English language finally explained.
In ancient and medieval physiology and medicine: the humour choler in an abnormal form having a dark or black colour; (also) the humour melancholy (in a normal or abnormal form). Also called atrabile. Compare slightly earlier "black cholera", and later "black bile".
Late Middle English; earliest use found in Guy de Chauliac's Grande Chirurgie. From black + choler, after post-classical Latin cholera nigra.
black choler/ˌblak ˈkɒlə/
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