[chawk-bawrd, -bohrd]
a blackboard, especially a green or other light-colored one.

1935–40, Americanism; chalk + board Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chalkboard (ˈtʃɔːkˌbɔːd)
(US), (Canadian) Also called (in Britain and certain other countries): blackboard 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

from chalk + board.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Once again he eschews chalkboard economics in favour of a reader-friendly guide
  to the economics of everyday life.
The diagrams on the chalkboard will still be familiar.
After a little time at the chalkboard they had their plan in place.
Thistle lists its ever-changing menu on a chalkboard, along with the names of
  its purveyors.
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