clep·sy·dra (klep’si-dra)
n. pl. clep·sy·dras or clep·sy·drae (-drE)

An ancient device that measured time by marking the regulated flow of water through a small opening. Also called water glass.

More on clepsydrae:

• Rees’ Clocks, Watches & Chronometers, 1819
• Encyclopedia.com
• Encyclopedia Britannica

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