WordReference Random House Unabridged Dictionary of American English © 2026
light′ box′, 
  1. a boxlike object having a uniformly lighted surface, as of ground glass, against which films or transparencies can be held for examination.
  • 1840–50

Collins Concise English Dictionary © HarperCollins Publishers::
light box n
  1. a light source contained in a box and covered with a diffuser, used for viewing photographic transparencies, negatives, etc
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'light box' also found in these entries (note: many are not synonyms or translations):
box kite

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