The longest word in the English language is ‘pneumonoultramicroscopicsilicovolcanoconiosis’ which describes a lung disease caused by breathing in particles of volcanic matter or a similar fine dust.

Pneumonoultramicroscopicsilicovolcanoconiosis is, 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.

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