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