from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A machine for projecting the images of opaque objects or transparencies on a screen.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A machine that projects images onto a screen.

from The Century Dictionary and Cyclopedia

  • n. An instrument for the optical projection of the images of opaque bodies on a screen by means of reflected or transmitted light.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an optical projector that gives images of both transparent and opaque objects


epi- + dia- + -scope.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From epi- + dia- + -scope. (Wiktionary)


  • He telegraphed to Mummy to come up to London and bring him up his epidiascope and slides, and he rigged it all up in the ship and started giving lectures to the crew.

    The Breaking Wave

  • Not that long ago, a classroom-style overhead projector (properly called an epidiascope) with A4 transparencies and a marker pen was the norm for most conferences.

    Brad Ideas - Comments

  • The main reason I missed out on the Autobio panel was because of preparing for the Pat Mills interview; the questions were all set up and ready, but I'd had the slightly last minute idea that yes, I would try to bring along some images after all, and so had hastily burned a CD with Misty pdfs in the morning while having breakfast, and got the epidiascope set up by oxfordslacker Alex Williams; not mentioned much in these reviews yet, but that's because he was rushing around being very unslack and organizing a whole bunch of stuff, putting old pizza boxes into recycling bags, etc.

    CAPTION2004 was history -- Friday


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  • For plain folk to get the straight dope
    A lecture was a way to cope.
    The ones they liked best,
    So records attest,
    Were blessed with an epidiascope.

    November 3, 2016