= Pneumonoultramicroscopicsilicovolcanoniosis =
Pneumonoultramicroscopicsilicovolcanoniosis is an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.n obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.1
1. http://dictionary.reference.com/search?r=2&q=pneumonoultramicroscopicsilicovolcanoconiosis