- n. automatic valve consisting of a hollow floating ball which by its rising and falling shuts and opens the valve
English contemporary dictionary. 2014.
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ballcock — UK [ˈbɔːlˌkɒk] / US [ˈbɔlˌkɑk] noun [countable] Word forms ballcock : singular ballcock plural ballcocks a floating ball that opens and closes a valve, used for controlling a water supply, for example in a toilet … English dictionary