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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Wa·ter clock An instrument or machine serving to measure time by the fall, or flow, of a certain quantity of water; a clepsydra.
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From: WordNet (r) 2.0

 water clock
      n : clock that measures time by the escape of water [syn: clepsydra,
           water glass]