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caisson [caissons]▼◼◼◼noun[UK: ˈkeɪs.n̩] [US: ˈkeɪs.n̩]
cofferdam (caisson, pneumatic caisson)▼noun[UK: ˈkɒ.fə.dæm] [US: ˈkɔː.fər.ˌdæm]
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