chalkboard

[chawk-bawrd, -bohrd]

Origin of chalkboard

An Americanism dating back to 1935–40; chalk + board
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for chalkboard

chalkboard

noun
  1. US and Canadian a hard or rigid surface made of a smooth usually dark substance, used for writing or drawing on with chalk, esp in teachingAlso called (in Britain and certain other countries): blackboard
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for chalkboard
n.

also chalk-board, 1816, from chalk (n.) + board (n.1).

Online Etymology Dictionary, © 2010 Douglas Harper