Hypertext Webster Gateway: "blackboard"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Blackboard \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.
From WordNet (r) 1.7 (wn)
blackboard
n : sheet of slate; for writing with chalk [syn: {chalkboard}]
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