/ Dictionary / Index C cyathus: Meaning and Definition of Find definitions for: cy•a•thus Pronunciation: (sī'u-thus), [key] — pl. -thi kyathos. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cyathium Cybele Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language