plaster

n. [ AS., a plaster (in sense 1), fr. L. emplastrum, Gr. &unr_;, &unr_;, fr. &unr_; to daub on, stuff in; &unr_; in + &unr_; to mold: cf. OF. plastre a plaster (in sense 2), F. plâtre. Cf. Plastic, Emplaster, Piaster. ] [ Formerly written also plaister. ] 1. (Med.) An external application of a consistency harder than ointment, prepared for use by spreading it on linen, leather, silk, or other material. It is adhesive at the ordinary temperature of the body, and is used, according to its composition, to produce a medicinal effect, to bind parts together, etc.; as, a porous plaster; sticking plaster. [ 1913 Webster ]

2. A composition of lime, water, and sand, with or without hair as a bond, for coating walls, ceilings, and partitions of houses. See Mortar. [ 1913 Webster ]

3. Calcined gypsum, or plaster of Paris, especially when ground, as used for making ornaments, figures, moldings, etc.; or calcined gypsum used as a fertilizer. [ 1913 Webster ]

Plaster cast, a copy of an object obtained by pouring plaster of Paris mixed with water into a mold. --
Plaster of Paris. [ So called because originally brought from a suburb of Paris. ] (Chem.) Anhydrous calcium sulphate, or calcined gypsum, which forms with water a paste which soon sets or hardens, and is used for casts, moldings, etc. The term is loosely applied to any plaster stone or species of gypsum. --
Plaster of Paris bandage (Surg.), a bandage saturated with a paste of plaster of Paris, which on drying forms a perfectly fitting splint. --
Plaster stone, any species of gypsum. See Gypsum. [ 1913 Webster ]