cofferdam
noun
cof·fer·dam
ˈkȯ-fər-ˌdam
ˈkä-
1
: a watertight enclosure from which water is pumped to expose the bottom of a body of water and permit construction (as of a pier)
2
: a watertight structure for making repairs below the waterline of a ship
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Merriam-Webster unabridged
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