cre·a·tine  (krē'ə-tēn', -tĭn)  n. A nitrogenous organic acid, C4H9N3O2, that is found in the muscle tissue of vertebrates mainly in the form of phosphocreatine and supplies energy for muscle contraction. [French créatine : from Greek kreas, kreat-, flesh; see kreuə- in Indo-European roots.] |