Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: French
Origin: caisse 'box', from Latin capsa; CASE1

caisson

 noun
     
Related topics: Weapons, Construction
cais‧son [countable]
1TBC a large box filled with air, that people go into to work under water, for example when building bridges
2PMW a large box for carrying ammunition
Definition from the Longman Dictionary of Contemporary English
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