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 Pneumonoultramicroscopicsilicovolcanoconiosis is an invented long word said to mean a lung disease caused by silica dust.It is the longest word in the  english language published in the oxford dictionary. 

It is pronounced as:

[noo-muh-noh-uhl-truh-mahy-kruh-skop-ik-sil-i-koh-vol-key-noh-koh-nee-oh-sis, nyoo-]
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It is often describe to be the longest word...it refers to a lung disease
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