cam·era lu·ci·da /-ˈlusədə/
  cam·era lu·ci·da /ˌkæm(ə)rəˈlusədə/ 名詞
  投影描繪器,投影描繪計,轉寫器,繪畫器
  Cam·e·ra lu·ci·da  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.
  ◄ ►
  camera lucida
       n : an optical device consisting of an attachment that enables
           an observer to view simultaneously the image and a
           drawing surface for sketching it