| ̷ ̷( ̷ ̷) ̷ ̷ˈlüsə̇də noun
( plural camera lucidas )
Etymology: New Latin, literally, light chamber
: an instrument that by means of a prism of a peculiar form or an arrangement of mirrors and often a microscope causes a virtual image of an external object to appear as if projected upon a plane surface (as of paper or canvas) so that an outline may be traced