'Clepsydra' definitions:

Definition of 'clepsydra'

(from WordNet)
noun
Clock that measures time by the escape of water [syn: water clock, clepsydra, water glass]

Definition of 'Clepsydra'

From: GCIDE
  • Clepsydra \Clep"sy*dra\ (?; 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]