Noun: caisson 'key,són or key-sun
- Large watertight chamber used for construction under water
"The engineers used a pneumatic caisson to build the bridge's underwater foundation";
- pneumatic caisson, cofferdam
- A chest to hold ammunition
"The soldiers carefully stored their rifles and ammunition in the caisson";
- ammunition chest
- (military) a two-wheeled military vehicle carrying artillery ammunition
"The caisson rumbled across the battlefield, supplying the artillery units"
- An ornamental sunken panel in a ceiling or dome
"The Renaissance palace featured intricate caissons on its ceilings";
- coffer, lacunar
Derived forms: caissons
Type of: chamber, chest, military vehicle, panel
Encyclopedia: Caisson