caisson
1. an ornamental sunken panel in a ceiling or dome • Syn: coffer, lacuna • Hypernyms: panel 2. a two-wheeled military vehicle carrying artillery ammunition • Topics: military, armed forces, armed services, military machine, war machine • Hypernyms: military vehicle 3. a chest to hold ammunition • Syn: ammunition chest • Hypernyms: chest 4. large watertight chamber used for construction under water • Syn: pneumatic caisson, cofferdam • Hypernyms: chamber
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