|Look up clepsydra, clepsydrae, or clepsydras in Wiktionary, the free dictionary.|
Clepsydra may refer to:
- Clepsydra (literally "water thief"), the Greek word for water clock. Also, in ancient Greece, a device (water thief) for drawing liquids from vats too large to pour, which utilized the principles of air pressure to transport the liquid from one container to another.
- Clepsydra Geyser in the Lower Geyser Basin of Yellowstone
- Clepsydra (diatom), a genus of protists
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