Medical Dictionary


noun phe·nyl·al·a·nine \ˌfen-əl-ˈal-ə-ˌnēn, ˌfēn-\

Medical Definition of PHENYLALANINE

:  an essential amino acid C9H11NO2 that is obtained in its levorotatory L-form by the hydrolysis of proteins (as lactalbumin), that is essential in human nutrition, and that is converted in the normal body to tyrosine—abbreviation Phe; see phenylketonuria, phenylpyruvic acid
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