/ Dictionary / Index C Cydnus: Meaning and Definition of Find definitions for: Cyd•nus Pronunciation: (sid'nus), [key] — n. a river in SE Asia Minor, in Cilicia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cyder cyesis Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language