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  1. Oxford Dictionary

    camera obscura

    • IPA[ˌkam(ə)rə(r) ɒbˈskjʊərə]

    英式

    • n.
      a darkened box with a convex lens or aperture for projecting the image of an external object on to a screen inside, a forerunner of the modern camera.；a small round building with a rotating angled mirror at the apex of the roof, projecting an image of the landscape on to a horizontal surface inside.

    • noun: camera obscura, plural noun: camerae obscurae