Plural of chalkboard; dark boards (usually dark green or black) on which you can write with chalk and easily erase, used for teaching and displaying information.
From 'chalk' (calcium-based writing material) + 'board' (flat surface). Chalkboards emerged in schools during the 19th century as an improvement over slate tablets.
Before whiteboards and smartboards, chalkboards were revolutionary technology that let teachers share writing with an entire class at once—the chalk dust on teachers' hands and clothes became a cultural symbol of the profession.
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