/ Dictionary / Index C creatine: Meaning and Definition of Find definitions for: cre•a•tine Pronunciation: (krē'u-tēn", -tin), [key] — n. Biochem. an amino acid, CHNO, that is a constituent of the muscles of vertebrates and is phosphorylated to store energy used for muscular contraction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: creatine (Thesaurus) create creatine kinase Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language