[ key-suh n, -son ]
/ ˈkeɪ sən, -sɒn /


Origin of caisson

1695–1705; < French, Middle French < Old Provençal, equivalent to caissa box (see case2) + -on augmentative suffix


cais·soned, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for caisson

British Dictionary definitions for caisson

/ (kəˈsuːn, ˈkeɪsən) /


a watertight chamber open at the bottom and containing air under pressure, used to carry out construction work under water
a similar unpressurized chamber
a watertight float filled with air, used to raise sunken shipsSee also camel (def. 2)
a watertight structure placed across the entrance of a basin, dry dock, etc, to exclude water from it
  1. a box containing explosives, formerly used as a mine
  2. an ammunition chest
  3. a two-wheeled vehicle containing an ammunition chest
another name for coffer (def. 3)

Word Origin for caisson

C18: from French, assimilated to caisse case ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012