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1 A flat-bottomed boat often used as a lighter or ferry.

2 A boat of special design to support a temporary road or footbridge across a river.

3 A hollow, watertight structure used in salvage for its lifting power when the water it contains is pumped out. See also caisson.

4 A floating structure frequently used at the ends of fixed piers or alongside quays so that it rises and falls with the tide to provide ease of access.

5 A low, flat vessel fitted with cranes, tackles, and capstans which was used in the days of sail to haul down, or careen, ships for bottom cleaning or repair.

Subjects: Warfare and Defence — Maritime History.

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