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achromatic prism

American  

noun

Optics.

  1. a system of two or more prisms of different substances that deflects but does not disperse a beam of light.

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.