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  1. Oxford American Dictionary

    camera obscura

    • IPA[ˌkam(ə)rə əbˈskyo͝orə]

    美式

    • n.
      a darkened box with a convex lens or aperture for projecting the image of an external object onto a screen inside. It is important historically in the development of photography.；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