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Definition of radical noun from the Oxford Advanced American Dictionary

      

    radical

     noun
    noun
    NAmE//ˈrædɪkl//
     
     
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  1. 1a person with radical opinions political radicals
  2. 2(chemistry) a group of atoms that behave as a single unit in a number of compounds see also free radical
See the Oxford Advanced Learner's Dictionary entry: radical