kreatine

from The Collaborative International Dictionary of English v.0.48

Creatin \Cre"a*tin\ (kr?"?-t?n), n. [Gr. ??? flesh.] (Physiol.
   Chem.)
   A white, crystalline, nitrogenous substance found abundantly
   in muscle tissue. [Written also {kreatine}.]
   [1913 Webster]