Top Definition
The longest english word in the world. It's a medical term used to describe a lung disease caused by the inhalation of very fine silica dust, causing inflammation in the lungs.
Don't breathe that fine silica dust, Jim. You could end up having pneumonoultramicroscopicsiliconovolcanoconiosis.
by Zasshu88 July 08, 2009
5 Words related to pneumonoultramicroscopicsiliconovolcanoconiosis

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