bulkhead

noun

1. 1

   A vertical partition dividing the hull into separate compartments; often made watertight to prevent excessive flooding if the ship's hull is breached.

2. 2

   A similar partition in an aircraft or spacecraft.

3. 3

   Mechanically, a partition or panel through which connectors pass, or a connector designed to pass through a partition.

4. 4

   A pressure-resistant sealed barrier to any fluid in a large structure.

5. 5

   A retaining wall along a waterfront.