wh-question - definition and synonyms

noun [countable] linguistics 

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/ˌdʌb(ə)ljuː ˈeɪtʃ ˌkwestʃ(ə)n/
singularwh-question
pluralwh-questions
  1. a question that begins with any of the words ‘who’, ‘where’, ‘when’, ‘what’, ‘why’, or ‘how’