/ Dictionary / Index C cilium: Meaning and Definition of Find definitions for: cil•i•um Pronunciation: (sil'ē-um), [key] — n. sing. of Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cilium (Thesaurus) Ciliophora Cilla Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language