Cofferdam meaning

kôfər-dăm, kŏfər-
A temporary watertight enclosure that is pumped dry to expose the bottom of a body of water so that construction, as of piers, can occur.
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A watertight chamber attached to the side of a ship to facilitate repairs below the water line.
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A watertight temporary structure in a river, lake, etc., for keeping the water from an enclosed area that has been pumped dry so that a bridge foundation, dam, or pier may be constructed.
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A watertight box or chamber attached to the side of a ship so that repairs can be made below the waterline.
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An empty space serving as a protective barrier, as between two compartments of a ship.
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A temporary watertight structure that is pumped dry to enclose an area underwater and allow construction work on a ship, bridge, or rig to be carried out; a caisson.
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(nautical) An empty space that acts as a protective barrier between two floors or bulkheads on a ship.
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