box caisson

noun

Definition of box caisson

: a heavy-timber watertight box open at the top, floated over a position prepared by dredging, and sunk by building a masonry pier within it

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“Box caisson.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/box%20caisson. Accessed 25 Nov. 2020.

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