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black·board
/ˈblakˌbôrd/noun
- 1. a large board with a smooth, typically dark, surface attached to a wall or supported on an easel and used for writing on with chalk, especially by teachers in schools.
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noun
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A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone. Wikipedia