caisson

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Noun caisson has 4 senses

coffer, caisson, lacuna - an ornamental sunken panel in a ceiling or dome
--₁ is a kind of panel
caisson - a two-wheeled military vehicle carrying artillery ammunition
--₂ is a kind of military vehicle
caisson, ammunition chest - a chest to hold ammunition
--₃ is a kind of chest
caisson, pneumatic caisson, cofferdam - large watertight chamber used for construction under water
--₄ is a kind of chamber