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| an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language. |
| a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S. |
phenylketonuria phen·yl·ke·to·nu·ri·a (fěn'əl-kēt'n-&oobreve;r'ē-ə, -y&oobreve;r'-, fē'nəl-)
n.
Abbr. PKU A genetic disorder in which the body lacks the enzyme necessary to metabolize phenylalanine to tyrosine. Left untreated, the disorder can cause brain damage and progressive mental retardation as a result of the accumulation of phenylalanine and its breakdown products.
phenylketonuria (fěn'əl-kēt'n- r'ē-ə, fē'nəl-) Pronunciation Key
A genetic disorder in which the body lacks an enzyme necessary to metabolize phenylalanine to tyrosine. If untreated, the disorder can cause brain damage and progressive mental retardation as a result of the accumulation of phenylalanine and its breakdown products. |
A hereditary disease that prevents the proper metabolism of phenylalanine, an amino acid. When phenylalanine is not metabolized properly, poisonous substances can build up in the body, causing brain damage and mental retardation. The effects of PKU can be controlled by a special diet.
Note: States commonly require newborns to be tested for PKU.