Blackboard (noun)

A large, smooth board painted or coated with dark paint, used for writing on with white or colored chalks.

Origin:

Late 18th century: from black + board.

Examples:

1. The teacher wrote the lesson on the blackboard.
2. I remember the sound of the chalk squeaking on the blackboard when the teacher was writing something.
3. The students were asked to copy the notes from the blackboard.
4. The blackboard was wiped clean ready for the next lesson.
5. The blackboard was replaced by whiteboard in most of the classrooms.