Seacock meaning

sē'kŏk'
A valve in the hull of a boat or ship that may be opened to let in or discharge water, as in filling or emptying a ballast tank.
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A valve below the waterline in the hull of a ship, used to take in seawater as for ballast.
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(nautical) A valve in the hull of a vessel used to let in water, either to clean the bilges, flood a ballast tank, or scuttle the vessel.
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