cofferdam

noun cof·fer·dam \ ˈkȯ-fər-ˌdam , ˈkä- \

Definition of cofferdam

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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Origin and Etymology of cofferdam


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