Ball-cock definition

Alternative spelling of ballcock.
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A self-regulating device controlling the supply of water in a tank, cistern, or toilet by means of a float connected to a valve that opens or closes with a change in water level.
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A device consisting of a valve connected by a lever to a floating ball that shuts the valve when raised and opens it when lowered, as in flush toilets.
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Other Word Forms

Noun

Singular:
ball-cock
Plural:
ball cocks