Nautical. any of various wall-like constructions inside a vessel, as for forming watertight compartments, subdividing space, or strengthening the structure.
2.
Aeronautics. a transverse partition or reinforcing frame in the body of an airplane.
3.
Civil Engineering.
a.
a partition built in a subterranean passage to prevent the passage of air, water, or mud.
b.
a retaining structure of timber, steel, or reinforced concrete, used for shore protection and in harbor works.
4.
Building Trades.
a.
a horizontal or inclined outside door over a stairway leading to a cellar.
b.
a boxlike structure, as on a roof, covering a stairwell or other opening.