Definition of "caissons" [caissons]

• Plural form of caisson. (noun)

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• "Then in August 2006, a city inspector examining a key part of the foundation known as the caissons discovered the plot of land wasn't solid enough to support design."
• "The caissons were the foundations of the great work, quite literally and figuratively, as everyone working with Roebling in Brooklyn was aware."
• "The tunnelers work in what are called caissons to which they have access through an air lock."