prism

Reading level: hard

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

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

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