One of the mysteries of the English language finally explained.
1Medicine. Any relatively severe form of purpura, especially when accompanied by haemorrhage into other organs; (in later use) specifically idiopathic thrombocytopenic purpura. Now rare.
2Veterinary Medicine. A potentially fatal disorder of horses characterized by purpura of the mucous membranes, oedema of the limbs, fever, and tachycardia, which results from an immune-mediated vasculitis, often as a complication of Streptococcus equi infection (strangles).
Early 19th century. From scientific Latin purpura haemorrhagica from post-classical Latin purpura + haemorrhagica, feminine of haemorrhagicus.
purpura haemorrhagica/ˈpəːpjʊrə ˌhɛməˈradʒɪkə/
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