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Noun: prism  pri-zum
  1. A polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms
  2. Optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image
    - optical prism

Derived forms: prisms

Type of: optical device, polyhedron

Part of: biprism, prism spectroscope, scope, spectroscope, telescope

Encyclopedia: Prism