Dictionary![]() ![]() or•ni•thinePronunciation: (ôr'nu-thēn"), [key] —n. Biochem. an amino acid, H2N(CH2)3CH(NH2)COOH, obtained by the hydrolysis of arginine and occurring as an intermediate compound in the urea cycle of mammals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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