chalkboard -
A slate board for writing on with chalk; a predecessor to a whiteboard.
Wikipedia
A blackboard or chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulfate, known, when used for this purpose, as chalk. Chalkboards were originally made of smooth, thin sheets of black or dark grey slate stone. Modern versions are often green or brown and are thus sometimes called a greenboard or brownboard instead.
OmegaWiki Dictionary
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chalkboard A dark-coloured board for writing on in chalk used especially in schools.
