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caisson noun

  /ˈkeɪ.sɑn/ , /ˈkeɪ.sən/
  • The gate across the entrance to a dry dock.
 батопорт, плавучий затво́р
  • (military) A large box to hold ammunition.
 зарядный я́щик
  • (engineering) An enclosure from which water can be expelled, in order to give access to underwater areas for engineering works etc.
 кессон
  • (nautical) A floating tank that can be submerged, attached to an underwater object and then pumped out to lift the object by buoyancy; a camel.
 понтон
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