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



Nearby words

  1. cairngorm,
  2. cairngorm mountains,
  3. cairngorms,
  4. cairns,
  5. cairo,
  6. caisson disease,
  7. caithness,
  8. caitiff,
  9. caitlin,
  10. caius

Origin of caisson

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

Related formscais·soned, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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

Word Origin and History for caisson



1704, from French caisson "ammunition wagon, box, crate," from Middle French caisson "large box" (16c.), from Italian cassone, augmentative form of cassa "a chest," from Latin capsa "a box" (see case (n.2)).

Online Etymology Dictionary, © 2010 Douglas Harper