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1. Oxford Dictionary

   microprism

   • IPA[ˈmʌɪkrə(ʊ)ˌprɪz(ə)m]

   英式

   • n.
     an area of the focusing screen of some reflex cameras which is covered with a grid of tiny prisms and splits up the image when the subject is not in focus.

   • noun: microprism, plural noun: microprisms