Definition of byword noun from the Oxford Advanced American Dictionary

     

    byword

     noun
    noun
    NAmE//ˈbaɪwərd//
     
    [usually singular]
     
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  1. 1 a byword for something a person or thing that is a well-known example of a particular quality The name Chanel became a byword for elegance.
  2. 2 a word or phrase that is well known or often used Andy Warhol's provocative slogan, “Everyone will be famous for fifteen minutes,” became a sixties byword.
See the Oxford Advanced Learner's Dictionary entry: byword