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  1. roof prism

    • IPA[ro͞of]
    • n.
      a reflecting prism in which the reflecting surface is in two parts that are angled like the two sides of a pitched roof.;a pair of binoculars using two roof prisms, resulting in an instrument with parallel sides and objective lenses that are the same distance apart as the eyepieces.
    • noun: roof prism, plural noun: roof prisms