Wiktionary
gypsum board
n. panels used for drywall construction
WordNet
gypsum board
n. wallboard with a gypsum plaster core bounded to layers of paper or fiberboard; used instead of plaster or wallboard to make interior walls [syn: plasterboard]
Usage examples of "gypsum board".
A few seconds later he found it, but in the rubble-filled darkness he slipped on a piece of gypsum board and fell, sliding down to the next landing and then bouncing down to another.
Large portions of water-damaged gypsum board had collapsed from the ceiling.