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What is a clepsydra?

A clepsydra, also known as a water clock, is an ancient device for measuring time by the gradual flow of water. The word clepsydra (plural clepsydrae or clepsydras) is derived from the Greek words meaning “to steal” and “water,” and is commonly translated as “the thief of water.” Clepsydras have been developed and used across cultures throughout human history.