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water clock

noun

Definition of water clock

: an instrument designed to measure time by the fall or flow of a quantity of water

— called also clepsydra

Examples of water clock in a Sentence

Recent Examples on the Web

 The need to gauge the divisions of the day and night led the ancient Egyptians, Greeks and Romans to create sundials, water clocks and other early chronometric tools. — William J. H. Andrewes, Scientific American, "Time Keeping Has a Long, Colorful History," 23 Jan. 2012

First Known Use of water clock

1601, in the meaning defined above

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