Definitions for: Blackboard

[n] sheet of slate; for writing with chalk

Webster (1913) Definition: Black"board` (-b[=o]rd`), 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.

Synonyms: chalkboard

See Also: flat solid, sheet