水すい密みつ扉とびら

noun

watertight door

Technical term used in maritime, engineering, and construction contexts for a door designed to prevent water from passing through.

• 船ふねの水すい密みつ扉とびらは、浸しん水すいを防ふせぐために閉しめておく必ひつ要ようがある。

  The ship's watertight doors must be kept closed to prevent flooding.