/ Dictionary / Index C cyathiform: Meaning and Definition of Find definitions for: cy•ath•i•form Pronunciation: (sī-ath'u-fôrm"), [key] — adj. Bot., Zool. shaped like a cup. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cyanuric acid cyathium 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