follow Dictionary.com

What is the X in X-mas?

blackboard

[blak-bawrd, -bohrd] /ˈblækˌbɔrd, -ˌboʊrd/
noun
1.
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.
Origin
1815-1825
1815-25; black + board
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for black board

blackboard

/ˈblækˌbɔːd/
noun
1.
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for black board

blackboard

n.

1823, from black + board (n.1). Blackboard jungle "inner-city school rife with juvenile delinquency" is from Evan Hunter's novel title (1954).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source

Word of the Day

Difficulty index for blackboard

Some English speakers likely know this word

Word Value for black

13
16
Scrabble Words With Friends