Meaning of cofferdam

cof•fer•dam

Pronunciation: (kô'fur-dam", kof'ur-), [key]
— n.
  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. a sealed void between two bulkheads, as for insulation or as an extra barrier to the escape of liquids or vapors.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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