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

 

croup

 noun
noun
BrE BrE//kruːp//
 
; NAmE NAmE//kruːp//
 
[uncountable]
 
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a disease of children that makes them cough a lot and have difficulty breathing Word Origin mid 18th cent.: from dialect croup ‘to croak’, of imitative origin.
See the Oxford Advanced American Dictionary entry: croup