green screen

American  

[green skreen] / ˈgrin ˌskrin /

noun

Movies, Television.

1. an electronic special-effects system, commonly used in television weather forecast segments, that isolates and removes a static plain green background from the live foreground shot so that the background can be filled or replaced with another image or video in a composite with the foreground.

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Etymology

Origin of green screen

First recorded in 1980–85