barbette

plural barbettes

1. A mound of earth or a platform in a fortification, on which guns are mounted to fire over the parapet.

   Cleverly camouflaged with grey felt, which exactly matched the colour of the walls, it led upwards to a barbette, or platform, perched beside the gate.

   1990, Peter Hopkirk, The Great Game, Folio Society, published 2010, page 276

2. nauticalThe inside fixed trunk of a warship's gun-mounting, on which the turret revolves. It contains the hoists for shells and cordite from the shell-room and magazine.

   The belted cruiser Pamiat Azova or Remembrance of Azoff, is 377 feet long. She is an improved Dmitri Dontskoi, and carries her two 8-inch guns in sponsoned barbettes on either broadside

   1899, John Scott-Keltie, editor, Statesman's Year-Book 1899