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cofferdam

[kaw-fer-dam, kof-er-] /ˈkɔ fərˌdæm, ˈkɒf ər-/
noun
1.
a watertight enclosure placed or constructed in waterlogged soil or under water and pumped dry so that construction or repairs can proceed under normal conditions.
2.
Nautical. a sealed void between two bulkheads, as for insulation or as an extra barrier to the escape of liquids or vapors.
Origin
1730-1740
1730-40; coffer + dam1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for cofferdams
  • The caissons or cofferdams are implanted deep into the floor of a lake or river.
British Dictionary definitions for cofferdams

cofferdam

/ˈkɒfəˌdæm/
noun
1.
a watertight structure, usually of sheet piling, that encloses an area under water, pumped dry to enable construction work to be carried out. Below a certain depth a caisson is required
2.
(on a ship) a compartment separating two bulkheads or floors, as for insulation or to serve as a barrier against the escape of gas or oil
Often shortened to coffer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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