One of the mysteries of the English language finally explained.
Originally: a collection of pus, especially within the eye. Later also: the formation of pus; suppuration; pyogenic infection.
Late 17th century; earliest use found in Blankaart's Physical Dictionary. From post-classical Latin pyosis collection of pus from Hellenistic Greek πύωσις suppuration from ancient Greek πύον pus + -ωσις.
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