Definition of demonstrator noun from the Oxford Advanced American Dictionary

      

    demonstrator

     noun
    noun
    NAmE//ˈdɛmənˌstreɪt̮ər//
     
     
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  1. 1a person who takes part in a public meeting or march in order to protest against someone or something or to show support for someone or something Troops opened fire on the demonstrators. pro-democracy demonstrators
  2. 2a person whose job is to show or explain how something works or is done He works as a demonstrator in anatomy at Princeton University.
See the Oxford Advanced Learner's Dictionary entry: demonstrator