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Pneumonoultramicroscopicsilicovolcanoconiosis means The disease silicosis
It's: Pneumonoultramicroscopicsilicovolcanoconiosis.
The word pneumonoultramicroscopicsilicovolcanoconiosis is a noun.
It was coined by Everett K Smith and is a factitious disease of the lungs.
pneumonoultramicroscopicsilicovolcanoconiosis
It is unknown for now. :(