A chalkboard or writing surface with a green surface rather than black, commonly used in classrooms and offices.
From green + board. Greenboards became popular in the mid-20th century as an alternative to traditional blackboards, partly due to reduced eye strain from the less harsh green color.
Greenboards were actually adopted in many schools because green is easier on the eyes than black when staring at a contrast surface for hours—which is why some researchers now argue they prevent headaches better than whiteboards with their harsh glare!
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