gypsum board

noun
wallboard composed primarily of gypsum and often used as sheathing.
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WordNet
gypsum board

noun
wallboard with a gypsum plaster core bonded to layers of paper or fiberboard; used instead of plaster or wallboard to make interior walls [syn: plasterboard
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Moisture meter, showing high moisture content in gypsum board behind tile.
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