One of the mysteries of the English language finally explained.
Purpura of the skin accompanied by pain and swelling of joints, seen especially in children; = "Henoch–Schönlein (or Schönlein–Henoch) purpura, syndrome".
Mid 19th century; earliest use found in Robley Dunglison (1798–1869), physician and medical writer. From scientific Latin peliosis rheumatica from peliosis + rheumatica, feminine of rheumaticus.
peliosis rheumatica/ˌpɛlɪˈəʊsɪs ruːˈmatɪkə//ˌpiːliˈəʊsɪs ruːˈmatɪkə/
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