ball cock
or ball·cock
noun
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
First recorded in 1780–90
Words nearby ball cock
ball and ring,
ball bearing,
ball boy,
ball clay,
ball club,
ball cock,
ball control,
ball fern,
ball foot,
ball game,
ball girl
Example sentences from the Web for ball cock
British Dictionary definitions for ball cock
ball cock
noun
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