• (n.) The application of a plaster or salve. • (n.) The act or process of grafting by inoculation; budding.
Em`plas·tra'tion noun [ Latin emplastratio a budding.] 1. The act or process of grafting by inoculation; budding. [ Obsolete] Holland. 2. [ See 1st Emplaster .] (Medicine) The application of a plaster or salve. 
In horticulture, emplastration is a method of budding in trees which involves surrounding the bud with a 'plaster' of bark.