Pneumonoultramicroscopicsilicovolcanoconiosis Share definition Flag a dumb word given to a disease caused from inflamation of the lungs due to inhaling volcano dust. Pneumonoultramicroscopicsilicovolcanoconiosis is a dumb disease. Pneumonoultramicroscopicsilicovolcanoconiosis by Incorrect Spellings Inc April 13, 2009 0 0 Get merch Get the Pneumonoultramicroscopicsilicovolcanoconiosis mug. Buy Now — $32.95 See more merch