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Meaning of caisson

cais•son

Pronunciation: (kā'sun, -son), [key]
— n.
  1. a structure used in underwater work, consisting of an airtight chamber, open at the bottom and containing air under sufficient pressure to exclude the water.
  2. a boatlike structure used as a gate for a dock or the like.
    1. Also calledcamel, pontoon.a float for raising a sunken vessel, sunk beside the vessel, made fast to it, and then pumped out to make it buoyant.
    2. a watertight structure built against a damaged area of a hull to render the hull watertight; cofferdam.
  3. a two-wheeled wagon, used for carrying artillery ammunition.
  4. an ammunition chest.
  5. a wooden chest containing bombs or explosives, used formerly as a mine.
  6. coffer (def. 4).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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