Pronunciation: (kô'fur-dam", kof'ur-), [key]
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. Naut.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.