water clock

a device, as a clepsydra, for measuring time by the flow of water.


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World English Dictionary
water clock or water glass
any of various devices for measuring time that use the escape of water as the motive force
water glass or water glass

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The sundial's nocturnal counterpart, the water clock, was designed to measure temporal hours at night.
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