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bulkhead

noun
🔊/ˈbʌlkhed/
🔊/ˈbʌlkhed/
 (specialist)
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  1. a wall that divides a ship or an aircraft into separate parts（船的）舱壁；（飞机的）隔框Topics Transport by waterc2, Transport by airc2
    Word Originlate 15th cent.: from Old Norse bálkr ‘partition’ + head.