plas·ter·board

[plas-ter-bawrd, -bohrd, plah-ster-]
noun
a material used for insulating or covering walls, or as a lath, consisting of paper-covered sheets of gypsum and felt.

Origin:
1905–10; plaster + board

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
plasterboard (ˈplɑːstəˌbɔːd) [Click for IPA pronunciation guide]
 
n
a thin rigid board, in the form of a layer of plaster compressed between two layers of fibreboard, used to form or cover walls

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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00:10
Plasterboard is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Encyclopedia Britannica
Encyclopedia

plasterboard

any of various large, rigid sheets of finishing material used in drywall construction to face the interior walls of dwellings and other buildings. Drywall construction is the application of walls without the use of mortar or plaster.

Learn more about plasterboard with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Fills cracks and other defects in plaster or plasterboard and sands patch using
  patching plaster, trowel and sanding tool.
Seal joints between plasterboard or other wallboard to prepare wall surface for
  painting or papering.
It is a monumental piece on three walls, painted on heavy plasterboard, and it
  tells a simple story of good overcoming evil.
The wall has been faced with plaster over wooden lath which has in tum been
  covered by plasterboard hung on studs.
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