Camera obscura : An apparatus in which the images of external objects, formed by a convex lens or a concave mirror, are thrown on a paper or other white surface placed in the focus of the lens or mirror within a darkened chamber, or box, so that the outlines may be traced.

Camera obscura : An apparatus in which the image of an external object or objects is, by means of lenses, thrown upon a sensitized plate or surface placed at the back of an extensible darkened box or chamber variously modified; -- commonly called simply the camera.

Example:


Taxonomy
camera obscura, hole, aperture, pinhole, pinhole camera, Optics, experiment, sunlight, camera, Physics, dark room, Ibn Al-Haitham, South Africa, Ibn al-Haytham, free encyclopedia, hole in one, origins, Alhazen.

Defination from the web:
Camera obscura in Encyclopédie, ou dictionnaire raisonné des sciences, des arts et des métiers ... The first camera obscura was built by the scientist Abu Ali Al-Hasan Ibn al-Haitham, born in Basra (965–1039 AD), known in the West as Alhacen or ...