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Pneumonoultramicroscopicsilicovolcanoconiosis abstract: Pneumonoultramicroscopicsilicovolcanoconiosis is, according to the Oxford English Dictionary, "a word invented in imitation of polysyllabic medical terms, alleged to mean a lung disease caused by the inhalation of very fine sand and ash dust (mostly volcanic silica ash dust) but occurring only as an instance of a very long word."Oxford English Dictionary; Pneumonoultramicroscopicsilicovolcanoconiosis definition in the Oxford English Dictionary A condition meeting the word's definition is normally called silicosis.
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