Clepsydra

Clepsydra may refer to:Clepsydra, an alternative name for a water clock. In ancient Greece, a device 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 Klepsydra well on the Akropolis.