Definitions

1. noun

A large, watertight chamber or box used in construction, especially to lay foundation stones or place concrete.

“The construction crew used a massive caisson to lay the foundation of the skyscraper.”

2. noun

A diving bell used by underwater workers, especially those laying submarine mines or working in deep water.

“The caisson was used to keep the miners safe while they worked underwater.”

3. noun

A type of shell or case used to carry artillery or other heavy equipment.

“The military deployed a caisson to transport the artillery to the front line.”