water clock

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water clock:

see clepsydraclepsydra
or water clock,
ancient device for measuring time by means of the flow of water from a container. A simple form of clepsydra was an earthenware vessel with a small opening through which the water dripped; as the water level dropped, it exposed marks on the
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.

water clock

[′wȯd·ər ‚kläk]
(horology)
An ancient device to estimate time; the operation depended upon the slow emptying of water from one graduated vessel into another, and the graduations marked the time periods.