plasterplasterplastersplasteredplastering2verb (plasters, plastering, plastered)1to cover a wall with plaster1 (1) to make it smooth2to cover a surface with a large amount of something: She plastered herself in suntan lotion.plasterplasterplasters1noun1(no plural) a substance that is used for covering walls inside buildings2(no plural)a hard covering around a broken bone; the substance that the covering is made of: My leg was in plaster.3(pluralplasters) (British) (AmericanBand-Aid™)a small piece of sticky material that you put over a cut on your body to keep it clean