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caisson (n.)

"ammunition wagon; wooden chest for bombs, gunpowder, etc.," 1704, from French caisson "ammunition wagon," originally "large box" (16c.), from Italian cassone, augmentative form of cassa "a chest," from Latin capsa "a box" (see case (n.2)).

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Definitions of caisson

caisson (n.)
an ornamental sunken panel in a ceiling or dome;
Synonyms: coffer / lacunar
caisson (n.)
a two-wheeled military vehicle carrying artillery ammunition;
caisson (n.)
a chest to hold ammunition;
Synonyms: ammunition chest
caisson (n.)
large watertight chamber used for construction under water;
Synonyms: pneumatic caisson / cofferdam
From wordnet.princeton.edu