[kree-at-n-een, -in] 
| a crystalline end product of creatine metabolism, C4H7N3O, occurring in urine, muscle, and blood. |
| cre·at·i·nine (krē-āt'n-ēn', -ĭn) n. A creatine anhydride, C4H7N3O, formed by the metabolism of creatine, that is found in muscle tissue and blood and normally excreted in the urine as a metabolic waste. [creatin(e) + -ine2.] |
creatinine cre·at·i·nine (krē-āt'n-ēn', -ĭn)
n.
A creatine anhydride formed by the metabolism of creatine and found in muscle tissue and blood and normally excreted in the urine as metabolic waste.
nˌin