[plas-ter-bawrd, -bohrd, plah-ster-] 
| a material used for insulating or covering walls, or as a lath, consisting of paper-covered sheets of gypsum and felt. |
| plas·ter·board (plās'tər-bôrd', -bōrd') 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. |
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.
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tərˌbɔrd