An ancient device for measuring time by marking the regulated flow of water through a small opening. A water clock.
L., from Gk. klepsudra, from kleptein "to steal" + hudor "water," PIE *wed- "water."
Pangân or pang was a clepsydra in Iran. It consisted of "a copper bason with a small hole in the bottom, for water in which it is placed to flow through, used for measuring time;" etymology unknown.