Bible Dictionaries
Blackboard
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Blackboard'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​b/blackboard.html. 1828.