(n) an essential amino acid found in proteins and needed for growth of children and for protein metabolism in children and adults; abundant in milk and eggs; it is normally converted to tyrosine in the human body
(n) a genetic disorder of metabolism; lack of the enzyme needed to turn phenylalanine into tyrosine results in an accumulation of phenylalanine in the body fluids which causes various degrees of mental deficiency, Syn.PKU
n. [ Gr. fai`nein to bring to light + -yl: cf. F. phényle. So called because it is a by-product of illuminating gas. ] (Chem.) A hydrocarbon radical (C6H5) regarded as the essential residue of benzene, and the basis of an immense number of aromatic derivatives. [ 1913 Webster ]
Phenyl hydrate (Chem.), phenol or carbolic acid. -- Phenyl hydrazine (Chem.), a nitrogenous base (C6H5.NH.NH2) produced artificially as a colorless oil which unites with acids, ketones, etc., to form easily crystallized compounds. It is used in organic chemistry, particulary to isolate compounds in pure form for analysis. [ 1913 Webster + PJC ]
n. [ Phenyl + amine. ] (Chem.) Any one of certain class of organic bases regarded as formed from ammonia by the substitution of phenyl for hydrogen. [ 1913 Webster ]
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