The Collaborative International Dictionary
Creatinin
Creatinin \Cre*at"i*nin\ (kr?-?t"?-n?n), n. (Physiol. Chem.) A white, crystalline, nitrogenous body closely related to creatin but more basic in its properties, formed from the latter by the action of acids, and occurring naturally in muscle tissue and in urine. [Written also kretinine.]
Wiktionary
creatinin
n. (alternative form of creatinine English)