\Blis"ter\, n. [OE.; akin to OD. bluyster, fr. the same
root as blast, bladder, blow. See {Blow} to eject wind.]
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. --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 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}.

\Blis"ter\, v. i. [imp. & p. p. {Blistered}; p. pr. &
vb. n. {Blistering}.]
To be affected with a blister or blisters; to have a blister
form on.
      Let my tongue blister.                   --Shak.

\Blis"ter\, v. t.
1. To raise a blister or blisters upon.
         My hands were blistered.              --Franklin.
2. To give pain to, or to injure, as if by a blister.
         This tyrant, whose sole name blisters our tongue.
                                               --Shak.