Here you will find one or more explanations in English for the word Camera lucida.
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Camera lucida
Camera lucida Cam"e*ra lu"ci*da [L. camera chamber + L.
lucidus, lucida, lucid, light.] (Opt.)
An instrument which by means of a prism of a peculiar form,
or an arrangement of mirrors, causes an apparent image of an
external object or objects to appear as if projected upon a
plane surface, as of paper or canvas, so that the outlines
may conveniently traced. It is generally used with the
microscope.
Meaning of Camera lucida from wikipedia