lightbox

Etymology
. In the Internet sense, originally the name of one specific technique.

Noun

 * 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)  A kind of pop-up that is overlaid across a web page while the rest of the content is dimmed.
 * 4)  A backbox.
 * 5) A device used in phreaking that indicates when a telephone line is in use by means of a light.