n.

1. a mixture of lime or gypsum with sand and water; hardens into a smooth solid; used to cover walls and ceilings
2. any of several gypsum cements; a white powder (a form of calcium sulphate) that forms a paste when mixed with water and hardens into a solid; used in making molds and sculptures and casts for broken limbs;
   plaster of Paris
3. a medical dressing consisting of a soft heated mass of meal or clay that is spread on a cloth and applied to the skin to treat inflamed areas or improve circulation etc.;
   poultice, cataplasm
4. a surface of hardened plaster (as on a wall or ceiling);
   plasterwork
   
   • there were cracks in the plaster
5. adhesive tape used in dressing wounds;
   adhesive plaster, sticking plaster

v.

1. cover conspicuously or thickly, as by pasting something on;
   beplaster
   
   • The demonstrators plastered the hallways with posters
   • She let the walls of the apartment be beplastered with stucco
2. affix conspicuously
   
   • She plastered warnings all over the wall
3. apply a plaster cast to
   
   • plaster the broken arm
4. apply a heavy coat to;
   plaster over, stick on
5. coat with plaster;
   daub
   
   • daub the wall
6. dress by covering with a therapeutic substance;
   poultice