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1. Oxford American Dictionary

   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