bulkhead

[buhlk-hed] Origin

bulk·head

[buhlk-hed]
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.
a.
a partition built in a subterranean passage to prevent the passage of air, water, or mud.
b.
a retaining structure of timber, steel, or reinforced concrete, used for shore protection and in harbor works.
4.
Building Trades.
a.
a horizontal or inclined outside door over a stairway leading to a cellar.
b.
a boxlike structure, as on a roof, covering a stairwell or other opening.

Origin:
1490–1500; bulk2 + head

bulk·head·ed, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Bulkhead is always a great word to know.
So is lollapalooza. Does it mean:
a stew of meat, vegetables, potatoes, etc.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Collins
World English Dictionary
bulkhead (ˈbʌlkˌhɛd)
 
n
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
 
[C15: probably from bulk projecting framework, from Old Norse bálkr partition + head]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

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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