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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