chalk board

chalkboard

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

Origin:
1935–40, Americanism; chalk + board

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World English Dictionary
chalkboard (ˈtʃɔːkˌbɔːd)
 
n
(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
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Etymonline
Word Origin & History

chalkboard
from chalk + board.
Online Etymology Dictionary, © 2010 Douglas Harper
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