BLACKBOARD
Source: 567
Black″board′ (–bōrd′), n. A broad board painted black, or any black surface on which writing, drawing, or the working of mathematical problems can be done with chalk or crayons. It is much used in schools.
Source: 567
Black″board′ (–bōrd′), n. A broad board painted black, or any black surface on which writing, drawing, or the working of mathematical problems can be done with chalk or crayons. It is much used in schools.