1. A vesicle of the skin, containing watery matter or serum, whether occasioned by a burn or other injury, or by a vesicatory; a collection of serous fluid causing a bladderlike elevation of the cuticle. And painful blisters swelled my tender hands. (Grainger)
3. A vesicatory; a plaster of spanish flies, or other matter, applied to raise a blister. Blister beetle, a beetle used to raise blisters, especially. The lytta (or cantharis) vesicatoria, called cantharis or spanish fly by druggists. See cantharis. Blister fly, a blister beetle. Blister plaster, a plaster designed to raise a blister; usually made of spanish flies. Blister steel, crude steel formed from wrought iron by cementation; so called because of its blistered surface. Called also blistered steel. Blood blister. See blood.