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Definition of prism noun from the Oxford Advanced American Dictionary

     

    prism

     noun
    noun
    NAmE//ˈprɪzəm//
     
     
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  1. 1(geometry) a solid figure with ends that are parallel and of the same size and shape, and with sides whose opposite edges are equal and parallel
  2. 2a transparent glass or plastic object, often with ends in the shape of a triangle, which separates light that passes through it into the colors of the rainbow
See prism in the Oxford Advanced Learner's Dictionary
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