Definition of prism noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈprɪzəm//
    ; NAmE 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 colours of the rainbow
  3. Word Originlate 16th cent.: via late Latin from Greek prisma ‘thing sawn’, from prizein ‘to saw’.
See the Oxford Advanced American Dictionary entry: prism