Medical Dictionary


noun or·ni·thine \ˈr-nə-ˌthēn\

Medical Definition of ORNITHINE

:  a crystalline amino acid C5H12N2O2 that functions especially in urea production as a carrier by undergoing conversion to citrulline and then arginine in reaction with ammonia and carbon dioxide followed by recovery along with urea by enzymatic hydrolysis of arginine
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