/ Dictionary / Index C cefaclor: Meaning and Definition of Find definitions for: cef•a•clor Pronunciation: (sef'u-klôr", -klōr"), [key] — n. Pharm. a cephalosporin antibiotic, CHClNO, used in the treatment of infections. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. C.E.F. cefoxitin Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language