D defs.my
Entry 1 sense Webster, 1913

Cofferdam

· Cof·fer·dam · IPA /ˈkɑ.fɚ.dæm/
01 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 th…
  1. 1.
    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.