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caisson
Definitions
[kəˈsuːn], (Noun)
Definitions:
- a large watertight chamber, open at the bottom, from which the water is kept out by air pressure and in which construction work may be carried out under water
- a chest or wagon for holding or conveying ammunition
Phrases:
Origin
:
late 17th century: from French, literally ‘large chest’, from Italian cassone, the spelling having been altered in French by association with caisse ‘case’
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definition by Oxford Dictionaries