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From Biology-Online Dictionary | Biology-Online Dictionary
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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)

2. Any elevation made by the separation of the film or skin, as on plants; or by the swelling of the substance at the surface, as on steel.

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.

Origin: oe.; akin to od. Bluyster, fr. The same root as blast, bladder, blow. See blow to eject wind.