lead

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lead (led) n. a soft bluish-grey metallic element that forms several poisonous compounds. Acute lead poisoning causes abdominal pains, vomiting, diarrhoea, and sometimes encephalitis. In chronic poisoning a characteristic blue mark on the gums (l. line) is seen and the peripheral nerves are affected; there is also anaemia. Treatment is with edetate. The use of lead in paints is now strictly controlled. Symbol: Pb.

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