n, -son]
| 1. | a structure used in underwater work, consisting of an airtight chamber, open at the bottom and containing air under sufficient pressure to exclude the water. |
| 2. | a boatlike structure used as a gate for a dock or the like. |
| 3. | Nautical.
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| 4. | a two-wheeled wagon, used for carrying artillery ammunition. |
| 5. | an ammunition chest. |
| 6. | a wooden chest containing bombs or explosives, used formerly as a mine. |
| 7. | Architecture. coffer (def. 4). |
| 1. | a box or chest, esp. one for valuables. |
| 2. | coffers, a treasury; funds: The coffers of the organization were rapidly filled by the contributions. |
| 3. | any of various boxlike enclosures, as a cofferdam. |
| 4. | Also called caisson, lacunar. Architecture. one of a number of sunken panels, usually square or octagonal, in a vault, ceiling, or soffit. |
| 5. | to deposit or lay up in or as in a coffer or chest. |
| 6. | to ornament with coffers or sunken panels. |
cais·son (kā'sŏn', -sən) n.
[French, from Old French, large box, alteration (influenced by caisse, chest) of casson, from Italian cassone, augmentative of cassa, box, from Latin capsa.] |