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ball cock

or ballcock

noun
1.
a device for regulating the supply of water in a tank, cistern, or the like, consisting essentially of a valve connected to a hollow floating ball which by its rise or fall shuts or opens the valve.
Origin of ball cock
1780-1790
1780-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for ball-cock
Historical Examples
  • In the larger sizes the tank is automatically refilled from a water service through a ball-cock.

  • And Oswald could not prevent his fiddling with the pipes and the ball-cock a little.

    New Treasure Seekers E. (Edith) Nesbit
  • It should have a large evaporating vessel, with a ball-cock to supply it.

    Lectures on Ventilation Lewis W. Leeds
  • A tank situated in the roof, and fed from the main by a ball-cock valve, communicates with A through the siphon pipe S.

    How it Works Archibald Williams
  • This cistern is fitted with a ball-cock, by which arrangement the liquid can be drawn off by a system of wooden pipes as required.

British Dictionary definitions for ball-cock

ball cock

noun
1.
a device for regulating the flow of a liquid into a tank, cistern, etc, consisting of a floating ball mounted at one end of an arm and a valve on the other end that opens and closes as the ball falls and rises with the water level in the cistern
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Difficulty index for ball cock

Few English speakers likely know this word

Word Value for ball

6
9
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Nearby words for ball-cock