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a hard or rigid surface made of a smooth usually dark substance, used for writing or drawing on with chalk, esp in teaching
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A panel, usually black but sometimes colored, for writing on with chalk. Also known as chalkboard.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
blackboard(1) See Blackboard Learning System.
(2) The traditional classroom presentation board that is written on with chalk and erased with a felt pad. Although originally black, "white" boards and colored chalks are also used. Collaborative blackboards on the computer are called "whiteboards," because screen backgrounds are typically white (see whiteboard).
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