brattice

1. A partition, typically of wood or cloth, erected in a mine for ventilation.
2. A breastwork erected during a siege.

[Middle English bretice, defensive structure, from Old French bretesche, from Medieval Latin bretescha (turris), British-style (tower), probably from Old English bryttisc, British.]

1. Bartizan.

2. Timber construction overhanging a wall on a fortification.

The verb has one meaning:

Meaning #1: supply with a brattice, to ventilate mines