blackboard
UK: /ˈblæk.bɔːd/ | US: /ˈblæk.bɔːrd/
n. A smooth, dark-colored surface, typically green or black, used for writing or drawing with chalk in classrooms.
The word "blackboard" is a straightforward compound of "black" (from Old English blæc, meaning "dark") and "board" (from Old English bord, meaning "plank" or "flat surface"). Originally, blackboards were literal dark-colored wooden boards, later replaced by slate or painted surfaces. The term reflects the functional design of early classroom writing surfaces.
The teacher wrote the lesson plan on the blackboard.
Please erase the blackboard after class.
Chalk dust covered the edges of the old blackboard.
Modern classrooms often replace blackboards with whiteboards.
She tapped the blackboard to emphasize her point.