'Cofferdam' definitions:
Definition of 'cofferdam'
(from WordNet)
noun
Large watertight chamber used for construction under water [syn: caisson, pneumatic caisson, cofferdam]
Definition of 'Cofferdam'
From: GCIDE
- 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. [1913 Webster]