Definition of bulkheads:
(n) :
(nautical) A vertical partition dividing the hull into separate compartments; often made watertight to prevent excessive flooding if the ship's hull is breached.
(n) :
(aerospace, rail transport) A similar partition in an aircraft or spacecraft, or some rail vehicles.
(n) :
(mechanics) A partition or panel through which connectors pass, or a connector designed to pass through a partition.
(n) :
A pressure-resistant sealed barrier to any fluid in a large structure.
(n) :
A retaining wall along a waterfront.
(n) :
(Rhode Island, Massachusetts, Maine) A cellar hatchway.