(within a fortification) a platform or mound of earth from which guns may be fired over the parapet instead of through embrasures.
2.
Navy. an armored cylinder for protecting the lower part of a turret on a warship.
Origin: 1765–75; < F, equiv. to barbebeard+ -ette-ette, prob. from the general metaphorical use of barbe for something which protrudes or faces outward