WordReference Random House Unabridged Dictionary of American English © 2017
lantern slide′, 
  • Photographya slide or transparency for projection by a slide projector or magic lantern.
    • 1870–75

    Collins Concise English Dictionary © HarperCollins Publishers::

    lantern slide n
    1. (formerly) a photographic slide for projection, used in a magic lantern

    'lantern slide' also found in these entries:

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