Found 2 items, similar to water clock.
English → English (WordNet) Definition: water clock water clock n : clock that measures time by the escape of water [syn: clepsydra, water glass]
English → English (gcide) Definition: Water clock Water clock \Wa"ter clock`\ An instrument or machine serving to measure time by the fall, or flow, of a certain quantity of water; a clepsydra. [1913 Webster]