Also means
caisson (engineering/architecture)
Usage Note
Caisson has several technical senses: a watertight chamber used in underwater construction, a sunken panel in a decorative ceiling (plafond à caissons), or a large ammunition chest. The medical term 'caisson disease' — the bends — is maladie des caissons in French. The everyday sense of 'big box' is less common than the technical uses.
Examples
"Les caissons du plafond sont dorés."
Natural Translation
The ceiling coffers are gilded.

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