[awr-nuh-theen] /ˈɔr nəˌθin/

noun, Biochemistry.
an amino acid, H 2 N(CH 2) 3 CH(NH 2)COOH, obtained by the hydrolysis of arginine and occurring as an intermediate compound in the urea cycle of mammals.
an amino acid produced from arginine by hydrolysis: involved in the formation of urea in the liver; diaminopentanoic acid. Formula: NH2(CH2)3CHNH2COOH

ornithine or·ni·thine (ôr’nə-thēn’)

Abbr. Orn An amino acid formed by the hydrolysis of arginine and important in the formation of urea.
An amino acid not found in proteins, formed by hydrolyzing arginine and important in the formation of urea. Chemical formula: C5H12N2O2.


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