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open caisson

noun
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Definition of open caisson

: a small cofferdam that is set in place, pumped dry, and filled with concrete to form a foundation (as for a pier)

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“Open caisson.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/open%20caisson. Accessed 12 December 2019.

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