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plateholder

[pleyt-hohl-der]
noun
  1. a lightproof container for a photographic plate, loaded into the camera with the plate and having a slide that is removed before exposing.
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Origin of plateholder

First recorded in 1870–75; plate1 + holder
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018