bartisan

noun

1. A parapet with battlements projecting from the top of a tower in a castle or church.

   “she soon found it had no communication with any other part of the battlements, being an isolated bartisan, or balcony, secured, as usual, by a parapet, with embrasures, at which a few archers might be stationed for defending the turret, and flanking with their shot the wall of the castle on that side.”

   “There were flambeaux on staggering poles every ten strides or so, and at intervals of about a hundred strides, bartizans whose guardroom windows glared like fireworks clung to the bridge piers.”