Bible Dictionaries
Cofferdam
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Cofferdam'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/c/cofferdam.html. 1828.