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stereopticon (plural stereopticons)

  1. A magic lantern, especially one with two projectors arranged so as to produce dissolving views or combinations of images.
    • 1898, Winston Churchill, chapter 1, in The Celebrity:
      The stories did not seem to me to touch life. […] They left me with the impression of a well-delivered stereopticon lecture, with characters about as life-like as the shadows on the screen, and whisking on and off, at the mercy of the operator.