pyosis
/pʌɪˈəʊsɪs/Medicine
noun
Originally: a collection of pus, especially within the eye. Later also: the formation of pus; suppuration; pyogenic infection.
Origin
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.