caisson

Noun
  1. An ornamental sunken panel in a ceiling or dome (synset 103068446)
    is a type of: panel - sheet that forms a distinct (usually flat and rectangular) section or component of something
    same as: coffer, lacunar
  2. A two-wheeled military vehicle carrying artillery ammunition (synset 102940720)
    referred to in: armed forces, armed services, military, military machine, war machine - the military forces of a nation
    is a type of: military vehicle - vehicle used by the armed forces
  3. A chest to hold ammunition (synset 102940621)
    is a type of: chest - box with a lid; used for storage; usually large and sturdy
    same as: ammunition chest
  4. Large watertight chamber used for construction under water (synset 102940477)
    is a type of: chamber - a natural or artificial enclosed space
    same as: cofferdam, pneumatic caisson

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