cofferdam

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noun cof·fer·dam \ˈkȯ-fər-ˌdam, ˈkä-\

Definition of cofferdam

  1. 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. 2 :  a watertight structure for making repairs below the waterline of a ship

Origin and Etymology of cofferdam

1coffer + 2dam


First Known Use: 1736


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