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Plaster A material applied to a wall-face while plastic, hardening on exposure to air. Internal plaster is generally made from gypsum (calcium sulphate) mixed with sand, but traditionally lime-based plasters were used. Ornamental plasterwork is made with hair or other fibrous material, to give it added strength. The interior walls of churches are usually either finished with lath and plaster, or with plaster applied directly to the masonry or brickwork - plastered 'on the hard'. In modern building plasterboard, a layer of plaster sandwiched between layers of protective material, is often used as a wall-finishing material.  Related Words Lath and plaster