/ Dictionary / Index C clepsydra: Meaning and Definition of Find definitions for: clep•sy•dra Pronunciation: (klep'si-dru), [key] — pl. -dras, -drae an ancient device for measuring time by the regulated flow of water or mercury through a small aperture. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: clepsydra (Thesaurus) clepe clept Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language