In general, a large, broad piece of anything thin, as paper, cloth, etc.; a broad, thin portion of any substance; an expanded superficies.
Open English WordNet identifies the related term as a broader lexical category for at least one sense.
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.
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In general, a large, broad piece of anything thin, as paper, cloth, etc.; a broad, thin portion of any substance; an expanded superficies.
Open English WordNet identifies the related term as a broader lexical category for at least one sense.
Their definitions overlap or refer to similar ideas. Use these to widen your search, then compare the exact meanings.
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