Definitions for wallboardˈwɔlˌbɔrd, -ˌboʊrd
Random House Webster's College Dictionary
material manufactured in large sheets for use in making or covering walls, ceilings, etc., as a substitute for wooden boards or plaster.
Category: Building Trades
Origin of wallboard:
wallboard, drywall, dry wall(noun)
a wide flat board used to cover walls or partitions; made from plaster or wood pulp or other materials and used primarily to form the interior walls of houses
a construction material of pre-made boards used for walls and ceilings, usually a gypsum-core with a paper surface.