2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Cofferdam \Cof"fer*dam\, n. A water-tight inclosure, as of piles packed with clay, from which the water is pumped to expose the bottom (of a river, etc.) and permit the laying of foundations, building of piers, etc. [1913 Webster] From WordNet (r) 2.0 [wn]: cofferdam n : large watertight chamber used for construction under water [syn: {caisson}, {pneumatic caisson}]
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