/ Dictionary / Index C creatine kinase: Meaning and Definition of Find definitions for: cre'atine ki'nase Pronunciation: [key] — Biochem. Biochem. an enzyme that, during muscular activity, catalyzes the transfer of a phosphoryl group from phosphocreatine in muscle to produce ATP. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. creatine creatine phosphate Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language