Term: Angioedema or angiooedema (British English)
Origin: Anc Greek
αγγείο-/angeio-(=vessel) combining forms that are used as prefix meaning a vessel > άγγος/aggos(=tube)
+ οίδημα/edema(=swelling) > οιδάνω/edano(=to swell) >οίδα/eda(="to see", as edema is seen due to its size)
Angio-oedema was described 1586 by Marcello Donati in a young count who was sensitive to egg. Hereditary angio-oedema was reported by Osler in 1885.