bulkhead

bulk +‎ head

• IPA^(key): /ˈbʌlk.hɛd/

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bulkhead (plural bulkheads)

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

   Coordinate term: deckhead

2. (aerospace) A similar partition in an aircraft or spacecraft.
3. (mechanics) A partition or panel through which connectors pass, or a connector designed to pass through a partition.
4. A pressure-resistant sealed barrier to any fluid in a large structure.
5. A retaining wall along a waterfront.
6. (Rhode Island, Massachusetts, Maine) A cellar hatchway.

• bulkhead line
• collision bulkhead