emplaster noun 1verb 1forms 3 noun1 •(no longer used) A plaster.Liniments are made of the same matter to the like purpose: emplasters of herbs, flowers, roots, &c. with oyls, and other liquors mixt and boiled together. — 1624 verb1 •(no longer used) To plaster. formsemplastered · emplastering · emplasters