caissons

[key-suhn, -son]

cais·son

[key-suhn, -son]
noun
1.
a structure used in underwater work, consisting of an airtight chamber, open at the bottom and containing air under sufficient pressure to exclude the water.
2.
a boatlike structure used as a gate for a dock or the like.
3.
Nautical.
a.
Also called camel, pontoon. a float for raising a sunken vessel, sunk beside the vessel, made fast to it, and then pumped out to make it buoyant.
b.
a watertight structure built against a damaged area of a hull to render the hull watertight; cofferdam.
4.
a two-wheeled wagon, used for carrying artillery ammunition.
5.
an ammunition chest.
EXPAND
6.
a wooden chest containing bombs or explosives, used formerly as a mine.
7.
Architecture. coffer (def. 4).
COLLAPSE

Origin:
1695–1705; < French, Middle French < Old Provençal, equivalent to caissa box (see case2) + -on augmentative suffix

cais·soned, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Caissons is always a great word to know.
So is flibbertigibbet. Does it mean:
the offspring of a zebra and a donkey.
a chattering or flighty, light-headed person.
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