/ Dictionary / Index K Keflex: Meaning and Definition of Find definitions for: Kef•lex Pronunciation: (kef'leks), [key] — Pharm., Trademark. Pharm.,Trademark. a brand of cephalexin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: keflex (Thesaurus) Keflavík keg Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language