Etymology

caisson

C3A1I1S1S1O1N1

Today it means: A (permanent) enclosure from which water can be expelled, in order to give access to underwater areas for engineering works etc. Full definition →

French caisson
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The story

  1. French · borrowed fromcaisson
  2. English todaycaisson

Borrowed from French caisson. Doublet of cassone and cajón.

Etymology from Wiktionary, CC BY-SA 4.0.