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

 

pustule

 noun
noun
BrE BrE//ˈpʌstjuːl//
 
; NAmE NAmE//ˈpʌstʃuːl//
 
(formal or medical)
 
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a spot on the skin containing pus Word Origin late Middle English: from Latin pustula.
See the Oxford Advanced American Dictionary entry: pustule