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CLEPSYDRA

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clep⋅sy⋅dra

[klep-si-druh]
–noun, plural -dras, -drae [-dree] .
an ancient device for measuring time by the regulated flow of water or mercury through a small aperture.

Origin:
1640–50; < L < Gk klepsýdra, equiv. to kleps- (klep-, s. of kléptein to steal, conceal + -s- formative in derivation) + hydra, deriv. of hýdōr water
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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clep·sy·dra   (klěp'sĭ-drə)   
n.   pl. clep·sy·dras or clep·sy·drae (-drē')
An ancient device that measured time by marking the regulated flow of water through a small opening. Also called water glass.

[Latin, from Greek klepsudra : kleptein, kleps-, to steal + hudōr, water; see wed-1 in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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