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