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Definition of water clock noun from the Oxford Advanced Learner's Dictionary

water clock

noun
 
/ˈwɔːtə klɒk/
 
/ˈwɔːtər klɑːk/
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  1. (in the past) a clock that used the flow of water to measure time
See water clock in the Oxford Advanced American Dictionary
hat-trick
noun
 
 
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