Pneumonoultramicroscopicsilicovolcanoconiosis

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Pneumonoultramicroscopicsilicovolcanoconiosis , according to the Oxford English Dictionary, "a factitious word alleged to mean 'a lung disease caused by the inhalation of very fine silica dust usually found in volcanoes'." It was coined to serve as supposedly the longest English word. The more general and widely used term for this
condition is pneumoconiosis, also known as black lung disease


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