Definition of bulkhead noun from the Oxford Advanced Learner's Dictionary

 

bulkhead

 noun
noun
BrE BrE//ˈbʌlkhed//
 
; NAmE NAmE//ˈbʌlkhed//
 
(specialist) Parts of a plane, Parts of boats and ships
 
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a wall that divides a ship or an aircraft into separate parts See related entries: Parts of a plane, Parts of boats and ships Word Origin late 15th cent.: from Old Norse bálkr ‘partition’ + head.
See the Oxford Advanced American Dictionary entry: bulkhead