/ Dictionary / Index C Cyril: Meaning and Definition of Find definitions for: Cyr•il Pronunciation: (sir'ul), [key] ? n. (?Apostle of the Slavs?), a.d. 827?869, Greek missionary to the Moravians. a male given name. Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease. See also: cyril (Thesaurus) Cyrene Cyrillic Related Content Daily Word Quiz: wizened Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language