diascope

From dia- +‎ -scope.

• IPA^(key): /ˈdaɪəskəʊp/

diascope (plural diascopes)

1. A projector used for projecting transparencies.
   • 1982, International Broadcast Engineer: IBE. - Volumes 181-196‎:

     The diascope test pattern reference for automatic setup is a transparency (Figure 3), built into all TK47B lenses.

   • 2004, M. Vanaja, Methods Of Teaching Physics‎, →ISBN, page 90:

     When it is used to project a slide then at serves as a diascope.

   • 2010, Elizabeth A. Martin, A Dictionary of Science‎, →ISBN, page 663:

     The diascope passes light through the two-dimensional object (such as a photographic transparency, slide, or film) and uses a converging projection lens to form an enlarged image on a distant screen.

2. a slide viewer, a device for looking at small transparent images.
3. (medicine) A flat piece of glass or transparent plastic, used to examine lesions in the skin
   • 1898, “Cutaneous Tuberculosis by Auto-infection”, in Indiana Medical Journal‎:

     The diascope (a flat piece of glass) was used to press out the blood and expose the apple-jelly points of marginal growth.

First attested in the 20th century. From dia- +‎ -scope.

• IPA^(key): /djas.kɔp/

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diascope m (plural diascopes)

1. overhead projector

• “diascope”, in Trésor de la langue française informatisé , 2012.