Definition of pus noun from the Oxford Advanced Learner's Dictionary

 

pus

 noun
noun
BrE BrE//pʌs//
 
; NAmE NAmE//pʌs//
 
[uncountable]
 
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a thick yellowish or greenish liquid that is produced in an infected wound The wound had not healed properly and was oozing pus. Word Origin late Middle English: from Latin.
See the Oxford Advanced American Dictionary entry: pus