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From The Collaborative International Dictionary of English v.0.48:
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.] [1913 Webster]