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ball (2)
ball and chain
ball-and-claw
ball and socket joint
ball bearing
ball boy
ball carrier
ball clay
ball cock
ball field
ball game
ball girl
ball gown
ball hockey
ball joint
ball lightning
ball of fire
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ball cock
ball cock (plural ball cocks)


noun 
Definition:
 
water level controller: a floating ball on the end of an arm that is connected to a valve controlling the water level in a tank. The valve opens as the ball falls and closes as it rises.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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