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bulkhead

[buhlk-hed] /ˈbʌlkˌhɛd/
noun
1.
Nautical. any of various wall-like constructions inside a vessel, as for forming watertight compartments, subdividing space, or strengthening the structure.
2.
Aeronautics. a transverse partition or reinforcing frame in the body of an airplane.
3.
Civil Engineering.
  1. a partition built in a subterranean passage to prevent the passage of air, water, or mud.
  2. a retaining structure of timber, steel, or reinforced concrete, used for shore protection and in harbor works.
4.
Building Trades.
  1. a horizontal or inclined outside door over a stairway leading to a cellar.
  2. a boxlike structure, as on a roof, covering a stairwell or other opening.
Origin
1490-1500
1490-1500; bulk2 + head
Related forms
bulkheaded, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for more bulkheaded

bulkhead

/ˈbʌlkˌhɛd/
noun
1.
any upright wall-like partition in a ship, aircraft, vehicle, etc
2.
a wall or partition built to hold back earth, fire, water, etc
Word Origin
C15: probably from bulk projecting framework, from Old Norse bálkr partition + head
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for more bulkheaded
bulkhead
late 15c., perhaps from bulk "framework projecting in the front of a shop" (1580s), which is perhaps from O.N. bolkr "beam, balk" (see balk).
Online Etymology Dictionary, © 2010 Douglas Harper
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