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A cementitious material, usually based on gypsum or portland cement, which is applied to lath or masonry in paste form, to harden into a finished surface; a mixture of lime, hair, and sand, or of lime, cement, and sand, used to cover exterior or interior wall surfaces; from Greek, emplastron, to daub on; Latin, emplastrum; French, platre; old English, plaister.

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