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light +‎ box. In the Internet sense, originally the name of one specific technique.


lightbox ‎(plural lightboxes)

  1. A box containing a source of light and a white, translucent cover, used to view photographic transparencies.
  2. A box containing fluorescent tubes or LED technology, used to treat people with seasonal affective disorder (SAD) and circadian rhythm disorders.
  3. (Internet) A kind of pop-up that is overlaid across a web page while the rest of the content is dimmed.