blister plaster

Webster's Dictionary (GCIDE)

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. [1913 Webster]

And painful blisters swelled my tender hands.— Grainger.[1913 Webster]

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. [1913 Webster]

3.A vesicatory; a plaster of Spanish flies, or other matter, applied to raise a blister. --Dunglison. [1913 Webster]

Blister beetle, a beetle used to raise blisters, esp. the Lytta vesicatoria (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 under Blood. [1913 Webster]