blister (blister)

[Early mod. E. also blys ter, bluster; by disintegration and effusion of serum into some of the softer epidermal layers, or ( b ) by an effusion of serum between the epidermis and corium. 2. An elevation made by the lifting up of an external film or skin by confined air or fluid, as on plants, or by the swelling of the substance at the surface, as on steel.-3. Something applied to the skin to raise a blister, as a plaster of Spanish flies, mustard, etc., as a means of counter-irritation; a vesicatory.-4. In castings of different materials, an effect caused by the presence of confined bubbles of air or gas.-5. A distortion of peach-leaves caused by the fungus Exoascus deformans; bladder-blight. See Exoascus. Also called blister ing. Flying blister, a blister applied for a time too short to cause vesication.