Wallboard definition

wôlbôrd
Fibrous material, composed of wood, gypsum, etc., formed into thin sheets for use in making or covering walls and ceilings in place of plaster, paneling, etc.
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A construction material of pre-made boards used for walls and ceilings, usually a gypsum core with a paper surface.
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Other Word Forms

Noun

Singular:
wallboard
Plural:
wallboards

Origin of wallboard