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ENGLISH · A WORD WITH POSSIBILITIES

caisson.

A (permanent) enclosure from which water can be expelled, in order to give access to underwater areas for engineering works etc.

7 characters2 syllables approx.English language

Meaning & usage

noun/ˈkeɪ.sən/UK/kəˈsuːn/UK, obsolete/ˈkeɪ.sɑn/US/ˈkeɪ.sən/US
  1. A (permanent) enclosure from which water can be expelled, in order to give access to underwater areas for engineering works etc.

  2. A structure with similar function that is temporary.

  3. A coffer (sunken panel).

  4. The gate across the entrance to a drydock.

  5. A floating tank that can be submerged, attached to an underwater object and then pumped out to lift the object by buoyancy.

  6. A two-wheeled, horse-drawn military vehicle used to carry ammunition (and a coffin at funerals).

  7. A large box to hold ammunition.

  8. A chest filled with explosive materials, used like a mine.

Where this word comes from

Borrowed from French caisson. Doublet of cassone and cajón.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.