Barbette

from WordNet (r) 3.0 (2006)

barbette
    n 1: (formerly) a mound of earth inside a fort from which heavy
         gun can be fired over the parapet

from The Collaborative International Dictionary of English v.0.48

Barbette \Bar*bette"\, n. [F. Cf. {Barbet}.] (Fort.)
   A mound of earth or a platform in a fortification, on which
   guns are mounted to fire over the parapet.
   [1913 Webster]

   {En barbette}, {In barbette}, said of guns when they are
      elevated so as to fire over the top of a parapet, and not
      through embrasures.

   {Barbette gun}, or {Barbette battery}, a single gun, or a
      number of guns, mounted in barbette, or partially
      protected by a parapet or turret.

   {Barbette carriage}, a gun carriage which elevates guns
      sufficiently to be in barbette. [See Illust. of
      {Casemate}.]
      [1913 Webster] Barbican