The American Heritage® Dictionary of the English Language, 4th Edition
n. A rigid board made of layers of fiberboard or paper bonded to a gypsum plaster core, used instead of plaster or wood panels in construction to form walls. Also called gypsum board, wallboard.
n. A construction material consisting of a rigid panel of several layers of fibreboard or paper bonded to a gypsum core.
v. To fit or reinforce with plasterboard.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. wallboard with a gypsum plaster core bonded to layers of paper or fiberboard; used instead of plaster or wallboard to make interior walls
Word Usage
"An estimated 100,000 houses across the country, most built in 2006 and 2007, may be affected, based on the 500 million pounds of Chinese drywall — also known as plasterboard or gypsum board — believed to have entered the U.S. during that period."