
1) Clock 2) Water clock 3) Water glass
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https://www.crosswordclues.com/clue/clepsydra
[genus] Clepsydra is a recently described genus of diatoms, including the species Clepsydra truganiniae. It was found in Tasmania. ...
Found on
http://en.wikipedia.org/wiki/Clepsydra_(genus)

instrument which measures time by trickling water
Found on
http://phrontistery.info/c.html

• (n.) A water clock; a contrivance for measuring time by the graduated flow of a liquid, as of water, through a small aperture. See Illust. in Appendix.
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http://thinkexist.com/dictionary/meaning/clepsydra/

ancient device for measuring time by the gradual flow of water. One form, used by the North American Indians and some African peoples, consisted of a ... [2 related articles]
Found on
http://www.britannica.com/eb/a-z/c/96

See water clock.
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http://www.encyclo.co.uk/visitor-contributions.php
Clep'sy·dra noun [ Latin from Greek ...; ... to steal, conceal + ... water.] A water clock; a contrivance for measuring time by the graduated flow of a liquid, as of water, through a small aperture. See
Illust. in
Appendix .
Found on
http://www.encyclo.co.uk/webster/C/90

A clepsydra was an ancient 'water clock' (actually timepiece) which measured time by the rate of the flow of water through small holes at the bottom of an earthenware globe.
Found on
http://www.probertencyclopaedia.com/browse/GC.HTM

clepsydra (s), clepsydrae (pl) 1. An ancient device that measured time by marking the regulated flow of water through a small opening. Also called water glass. 2. The word is compounded with a Greek stem that means 'to steal', and 'water'; with the allusion that the water is flowing stealthily (flowing secretly) from it. It is said that cl...
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http://www.wordinfo.info/words/index/info/view_unit/2525/

an ancient device for measuring time by the regulated flow of water or mercury through a small aperture.
Found on
https://www.infoplease.com/dictionary/clepsydra
No exact match found.