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Pneumonoultramicroscopicsilicovolcanoconiosis, the longest word in the English language since it was invented in 1935, is a lung disease created by the inhalation of fine silica dust particles. It is sometimes known as "miner's lung" because it is common for coal miners to get this disease, what with being in the mines all day.

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Q: What is th definition of pneumonoultramicroscopicsilicovolcano...?
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