En barbette

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

See also: Barbette

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
It held 200 cannon arranged with one tier of guns in casements and the other en barbette.
Each battery had two to eight guns, including 10-inch and 12-inch pieces, all on various carriages rapid fire, antiaircraft, en barbette, disappearing and mortar.