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Noun: caisson  'key,són or key-sun
  1. An ornamental sunken panel in a ceiling or dome
    - coffer, lacuna
     
  2. (military) a two-wheeled military vehicle carrying artillery ammunition
     
  3. A chest to hold ammunition
    - ammunition chest
     
  4. Large watertight chamber used for construction under water
    - pneumatic caisson, cofferdam

Derived forms: caissons

Type of: chamber, chest, military vehicle, panel

Encyclopedia: Caisson