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countable and uncountable, plural wallboards
A construction material of pre-made boards used for walls and ceilings, usually a gypsum core with a paper surface. quotations examples
Hooks come with screws for use in plaster or wood and toggles for use in wallboard. One hook should be sufficient to swag a lamp from a ceiling outlet.
1991, Kalton C. Lahue, Cheryl Smith, Interior Lighting, page 19