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clepsydra

[klep-si-druh] /ˈklɛp sɪ drə/
noun, plural clepsydras, clepsydrae
[klep-si-dree] /ˈklɛp sɪˌdri/ (Show IPA)
1.
an ancient device for measuring time by the regulated flow of water or mercury through a small aperture.
Origin
1640-1650
1640-50; < Latin < Greek klepsýdra, equivalent to kleps- (klep-, stem of kléptein to steal, conceal + -s- formative in derivation) + hydra, derivative of hýdōr water
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for clepsydra

clepsydra

/ˈklɛpsɪdrə/
noun (pl) -dras, -drae (-ˌdriː)
1.
an ancient device for measuring time by the flow of water or mercury through a small aperture Also called water clock
Word Origin
C17: from Latin, from Greek klepsudra, from kleptein to steal + hudōr water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for clepsydra
n.

"ancient Greek water clock," 1640s, from Latinized form of Greek klepsydra, from stem of kleptein "to steal, to hide" (see kleptomania) + hydor "water" (see water (n.1)).

Online Etymology Dictionary, © 2010 Douglas Harper
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