Definitions for ball cock
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Random House Webster's College Dictionary
ball′ cock`(n.)
a device for regulating water in a tank, consisting of a valve connected to a floating ball that by its rise or fall shuts or opens the valve.
Category: Building Trades, Hydraulogy
Origin of ball cock:
1780–90
Princeton's WordNet
ballcock, ball cock(noun)
floating ball that controls level in a water tank
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