Definition of wh-question noun from the Oxford Advanced Learner's Dictionary

 

wh-question

 noun
noun
BrE BrE//ˌdʌbljuː ˈeɪtʃ kwestʃən//
 
; NAmE NAmE//ˌdʌbljuː ˈeɪtʃ kwestʃən//
 
(grammar)
 
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a question that begins with ‘who’, ‘where’, ‘when’, ‘what’, ‘why’, or with ‘how’ compare yes-no question
See the Oxford Advanced American Dictionary entry: wh-question