microprism

noun
mi·​cro·​prism | \ ˈmī-krə-ˌpri-zəm How to pronounce microprism (audio) \

Definition of microprism

: a usually circular area on the focusing screen of a camera that is made up of tiny prisms and that causes the image in the viewfinder to blur if the subject is not in focus

First Known Use of microprism

1962, in the meaning defined above

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The first known use of microprism was in 1962

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