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Ctesibius (tĭsĭbˈēəs) [key], fl. 2d cent. B.C., Alexandrian Greek inventor. He reputedly was the first to discover and apply the expansive power of air as a motive force. Among the inventions ascribed to him are a water clock (clepsydra), a hydraulic organ, and a force pump.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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