n. [ Gr. &unr_;&unr_;&unr_; flesh. ] (Physiol. Chem.) A white, crystalline, nitrogenous substance found abundantly in muscle tissue.
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.