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"Pneumonoultramicroscopicsilicovolcanoconiosis" is a term that refers to a type of lung disease caused by inhaling very fine silicate or quartz dust, usually found in volcanoes. This condition is similar to silicosis, which is more commonly known. The word is often cited as one of the longest words in the English language and was coined to be a deliberate example of a long word. It is rarely used in medical contexts.
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