[blak-bawrd, -bohrd]
a sheet of smooth, hard material, especially dark slate, used in schools, lecture rooms, etc., for writing or drawing on with chalk.
Also called chalkboard.
Compare greenboard.

1815–25; black + board Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
blackboard (ˈblækˌbɔːd)
a hard or rigid surface made of a smooth usually dark substance, used for writing or drawing on with chalk, esp in teaching

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1823, from black + board. Blackboard jungle "inner-city school rife with juvenile delinquency" is from Evan Hunter's novel title (1954).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Writing the ideas on the blackboard may reinforce reading skills.
He argues that economists should abandon blackboard deduction in favour of computer simulation.
It has no desks, only a single blackboard and intermittent supplies of chalk.
Accept all answers as valid and place the word or words on overhead, blackboard or newsprint.
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