blister

Isaac Kremer/ September 9, 2018/ / 0 comments

A defect in the form of a slight projection of a surface detached from the body of the material, caused in manufacturing or by weather or other agencies, as the protuberance sometimes formed on the face of a casting, due to the presence of an air bubble just below the surface; or the loose, slightly raised portions of a coat of paint which have become detached from the material to which the paint has been applied, due to defective workmanship or other causes. (Sturgis, 1900)