0 a dark surface on a wall or frame that a teacher writes on with chalk (= white substance)
1 a chalkboard
The lecturer illustrated his point with a diagram on the blackboard.
If the shape of a room is shown on the blackboard, what have we drawn?
Make a scoreboard on the blackboard, indicating each row by a number of letter.
The teacher would write six easy characters each afternoon on the blackboard for the girls to copy before going home.
