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pus
pathology
pus, thick, opaque, usually yellowish white fluid matter formed in association with inflammation caused by the invasion of the body by infective microorganisms (such as bacteria). It is composed of degenerating white blood cells (leukocytes), tissue debris, and living or dead microorganisms. See inflammation.
The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Kara Rogers.
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