Definition of pus
: a thick, opaque, usually yellowish-white, fluid matter that is formed as part of an inflammatory response typically associated with an infection and is composed of exudate chiefly containing dead white blood cells (such as neutrophils), tissue debris, and pathogenic microorganisms (such as bacteria)
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Merriam-Webster unabridged
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Time Traveler for pus
The first known use of pus was in the 15th century
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