1. A watertight chamber or box used in construction work underwater or in wet ground, allowing workers to excavate and build foundations.
Usage: engineering, construction
2. A large chest or box for storing ammunition or explosives.
Usage: military
3. A wheeled vehicle or cart used to transport ammunition or supplies, especially in military contexts.
Usage: military, historical

Examples

• The construction crew used caissons to build the bridge foundation beneath the river.
• Workers inside the caisson excavated soil while maintaining air pressure to keep water out.
• The military stored gunpowder in large caissons transported by horse-drawn wagons.
• The palace ceiling featured ornate caissons carved with intricate designs.
• Divers prepared the caisson for the underwater tunnel project.
• Historical caissons from the Civil War are now displayed in the museum.