BLISTER n.
A vesicatory; a plaster of Spanish flies, or other matter, applied to raise a blister. Dunglison. Blister beetle, a beetle used to raise blisters, esp. the Lytta (or Cantharis) vesicatoria, called Cantharis or Spanish fly by druggists. See Cantharis. -- Blister fly, a blister beetle. -- Blister plaster, a plaster des…