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Meaning of prism

prism

Pronunciation: (priz'um), [key]
— n.
  1. a transparent solid body, often having triangular bases, used for dispersing light into a spectrum or for reflecting rays of light.
  2. a solid having bases or ends that are parallel, congruent polygons and sides that are parallelograms.
  3. a form having faces parallel to the vertical axis and intersecting the horizontal axes.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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