Plas"ter (?), n. [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. 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.

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.

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.

Plas"ter, v. t. [imp. & p. p. Plastered (?); p. pr. & vb. n. Plastering.] [Cf. OF. plastrer to plaster (in sense 2), F. plâtrer.] 1. To cover with a plaster, as a wound or sore.

2. To overlay or cover with plaster, as the ceilings and walls of a house.

3. Fig.: To smooth over; to cover or conceal the defects of; to hide, as with a covering of plaster. Bale.

• A mixture of lime or gypsum, sand, and water, sometimes with the addition of fibres, that hardens to a smooth solid and is used for coating walls and ceilings
  
• Plaster of Paris
  
• A paste applied to the skin for healing or cosmetic purposes
  
• (British) An small adhesive bandage to cover a minor wound (a sticking plaster)
  
• To cover or coat something with plaster, or apply a plaster
  
• To hide or cover up, as if with plaster
       The radio station plastered the buses and trains with its advertisement.
  
  Swedish
• Indefinite plural of plast