One of the mysteries of the English language finally explained.
Medicine. Originally: †an abscess (obsolete). In later use (Veterinary Medicine): abscess formation.
Late 16th century (in an earlier sense). From classical Latin abscēssiōn-, abscēssiō removal, loss, in post-classical Latin also apostasy, departure from abscēss-, past participial stem of abscēdere + -iō. In medical uses in sense 2 apparently by association with abscess and (in later use) abscessation.
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