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wallboard

[wawl-bawrd, -bohrd] /ˈwɔlˌbɔrd, -ˌboʊrd/
noun
1.
material manufactured in large sheets for use in making or covering walls, ceilings, etc., as a substitute for wooden boards or plaster.
Origin
1905-1910
1905-10; wall + board
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for wall-board

wallboard

/ˈwɔːlˌbɔːd/
noun
1.
a thin board made of materials, such as compressed wood fibres or gypsum plaster, between stiff paper, and used to cover walls, partitions, etc
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
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7
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