[1] : The Collaborative International Dictionary of English v.0.48

clepsydra \clep"sydra\ ?; 277, n. l. from gr. ?; ? 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.
   1913 webster
see also:
appendix 

[2] : WordNet (r) 2.0

clepsydra
     n : clock that measures time by the escape of water syn: water
         clock, water glass
     also: clepsydrae pl
see also:
water clock water glass clepsydrae 

Clepsydra >> C Words
Clepsydra, definition of term: Clepsydra
clepsydra_pag1.html