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单词 prism
释义

WordReference Random House Learner's Dictionary of American English © 2024
prism /ˈprɪzəm/USA pronunciation   n. [countable]
  1. Opticsa transparent solid object used for breaking up light into a spectrum of colors.
  2. Mathematics[Geometry.]a solid having parallel bases and parallel sides.
pris•mat•ic /prɪzˈmætɪk/USA pronunciation  adj. 

WordReference Random House Unabridged Dictionary of American English © 2024
prism  (prizəm),USA pronunciation n. 
  1. Opticsa transparent solid body, often having triangular bases, used for dispersing light into a spectrum or for reflecting rays of light.
  2. Mathematics[Geom.]a solid having bases or ends that are parallel, congruent polygons and sides that are parallelograms.
  3. Crystallographya form having faces parallel to the vertical axis and intersecting the horizontal axes.
  • Greek prîsma literally, something sawed, akin to prí̄zein to saw, prīstēs sawyer
  • Late Latin prīsma
  • 1560–70

Collins Concise English Dictionary © HarperCollins Publishers::
prism /ˈprɪzəm/ n
  1. a transparent polygonal solid, often having triangular ends and rectangular sides, for dispersing light into a spectrum or for reflecting and deviating light. They are used in spectroscopes, binoculars, periscopes, etc
  2. a polyhedron having parallel, polygonal, and congruent bases and sides that are parallelograms
Etymology: 16th Century: from Medieval Latin prisma, from Greek: something shaped by sawing, from prizein to saw
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