| Word | Definitions | Synonyms |
|---|---|---|
| caisson | (noun) large watertight chamber used for construction under water | Synonyms: cofferdam, pneumatic caisson |
| (noun) an ornamental sunken panel in a ceiling or dome | Synonyms: coffer, lacunar | |
| (noun) a chest to hold ammunition | Synonyms: ammunition chest | |
| (noun) a two-wheeled military vehicle carrying artillery ammunition | - |