Hypertext Webster Gateway: "cofferdam"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
cofferdam
n : large watertight chamber used for construction under water
[syn: {caisson}, {pneumatic caisson}]
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