bulkhead
UK[ˈbʌlk.hɛd]US[ˈbʌlk.hɛd]
n
A strong wall or barrier dividing a ship, aircraft, or vehicle into compartments to prevent the spread of fire or water.
n
A similar retaining or protective wall in construction or mining.
Morpheme Breakdown
bulk
head
bulk
projection
head
head, top
Etymology
The word "bulkhead" originates from nautical terminology of the 15th century. It is a compound of the Middle English "bulk," referring to a partition or a projecting framework in a ship's hold, and "head," denoting the front or top part of such a structure. Literally, it described a built-up "head" or front for a "bulk" (partition), designed to separate cargo or hull sections. Over time, the specific nautical sense of a watertight compartment wall generalized to any similar protective barrier in engineering and construction, retaining its core idea of a strong, dividing shield.
Analysis
Structure: bulk (projection) + head (head, top)
bulk: Middle English, from Old Norse 'bulki' (cargo, heap). In this compound, it likely refers to a projecting structure or a partition.
head: Old English 'hēafod' (top, chief part). In this compound, it refers to the top or front part of a structure.
Examples
The crew sealed the watertight bulkhead to contain the flooding.
A reinforced bulkhead separates the passenger cabin from the cargo hold in the aircraft.
Engineers installed a steel bulkhead to stabilize the sides of the excavation.