1. (Science: medicine) 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.
3. Calcined gypsum, or plaster of paris, especially when ground, as used for making ornaments, figures, moldings, etc.; or calcined gypsum used as a fertiliser. 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.
Origin: AS, a plaster (in sense 1), fr. L. Emplastrum, Gr, fr. To daub on, stuff in; in _ to mold: cf. OF. Plastre a plaster (in sense 2), F. Platre. Cf. Plastic, Emplaster, Piaster] [Formerly written also plaister.