Illustration of caisson
- caisson 1b
1
a
: a chest to hold ammunition
b
: a usually 2-wheeled vehicle for artillery ammunition attachable to a horse-drawn limber
also
: a limber with its attached caisson
2
a
: a watertight chamber used in construction work under water or as a foundation
b
: a hollow floating box or a boat used as a floodgate for a dock or basin
3
Examples of caisson in a Sentence
Recent Examples on the Web
In June 2025, the caisson program restarted following an $18 million overhaul by the Army.
—
Andrew Paul, Popular Science, 9 July 2025
The refurbishment included a complete overhaul, including a paint job, the repairing of caisson cracks, window and door replacements, cleaning and re-pointing of the foundation masonry, restoring all wood floors, and reconstruction of the intermediate landing between the bridge and gangway.
—Michael P. McKinney, USA Today, 7 June 2025
In February, Bally’s began driving foundational caissons into the ground, with executives targeting a September 2026 opening for the casino.
—Robert Channick, Chicago Tribune, 14 May 2025
The caisson horses in service before the pause have been rehabilitated and retired, and since then, the Army has procured 46 horses.
—Eleanor Watson, CBS News, 8 Apr. 2025
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Andrew Paul, Popular Science, 9 July 2025
The refurbishment included a complete overhaul, including a paint job, the repairing of caisson cracks, window and door replacements, cleaning and re-pointing of the foundation masonry, restoring all wood floors, and reconstruction of the intermediate landing between the bridge and gangway.
—Michael P. McKinney, USA Today, 7 June 2025
In February, Bally’s began driving foundational caissons into the ground, with executives targeting a September 2026 opening for the casino.
—Robert Channick, Chicago Tribune, 14 May 2025
The caisson horses in service before the pause have been rehabilitated and retired, and since then, the Army has procured 46 horses.
—Eleanor Watson, CBS News, 8 Apr. 2025
See All Example Sentences for caisson
Cite this Entry
“Caisson.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/caisson. Accessed 8 Sep. 2025.
Copy CitationKids Definition
caisson
noun
cais·son
ˈkā-ˌsän 
ˈkā-sᵊn
1
a
: a chest for ammunition
b
: a usually two-wheeled vehicle for artillery ammunition
2
: a watertight chamber used in construction work underwater or as a foundation
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