• IPA: /ˈpɹɪzəm/, [pʰɹ̠̊ɪzm̩]

prism (plural prisms)

  1. (geometry) A polyhedron with parallel ends of the same size and shape, the other faces being parallelogram-shaped sides.
  2. A transparent block in the shape of a prism (typically with triangular ends), used to split or reflect light.
  3. A crystal in which the faces are parallel to the vertical axis.
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