Learn how to say Obscura correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word camera obscura:
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.
early 18th century: from Latin, ‘dark chamber’