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watertight adjective

  /ˈwɑː.tɚ.taɪt/ , /ˈwɔː.tə.taɪt/ , /ˈwɔː.tɚ.taɪt/
  • So tightly made that water cannot enter or escape.
 étanche

watertightness noun

  • (rare) The condition of being watertight
 étanchéité
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