Pneumonoultramicroscopicsilic ovolcanoconiosis-
according to the Oxford English Dictionary, "a factitious word alleged to mean 'a lung disease caused by the inhalation of very fine silica dust, causing inflammation in the lungs.'" A condition meeting the word's definition is normally called silicosis.
Longest word in the English language! Even longer than antidisestablishmentterrianis m! Also... Bump
