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prism

noun
/ˈprɪzəm/
/ˈprɪzəm/
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  1. (geometry几何) a solid figure with ends that are parallel (= the same distance apart at every point) and of the same size and shape, and with sides whose opposite edges are equal and parallel棱柱体;棱柱
    Topics Colours and Shapesc2
  2. a clear 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棱镜;三棱镜
  3. Word Originlate 16th cent.: via late Latin from Greek prisma ‘thing sawn’, from prizein ‘to saw’.

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