CAISSON

Definition:

1. [noun] an ornamental sunken panel in a ceiling or dome
   Synonyms: coffer, lacuna
   
   
2. [noun] a two-wheeled military vehicle carrying artillery ammunition
   
   
3. [noun] a chest to hold ammunition
   Synonyms: ammunition chest
   
   
4. [noun] large watertight chamber used for construction under water
   Synonyms: pneumatic cofferdam
   
   

Synonyms:

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