/ Dictionary / Index C caesium: Meaning and Definition of Find definitions for: cae•si•um Pronunciation: (sē'zē-um), [key] — n. Chem. cesium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: caesium (Thesaurus) Caesar salad caespitose Related Content Daily Word Quiz: pertinent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language