creatine or creatin /krēˈə-tin or -tēn/ noun A nitrogenous compound (C4H9N3O2), found in the striped (voluntary) muscle of vertebrates ORIGIN: Gr kreas, kreatos flesh crēˈatinine /-nin or -nēn/ noun Dehydrated creatine (C4H7N3O) found in urine and muscles creatine phosphate noun The phosphate ester of creatine, capable of converting ADP to ATP, and used as a short-term source of energy during bursts of muscular activity |