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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.

The 45-letter word is the longest word ever to appear in an English language dictionary and is listed in the current edition of several dictionaries.

Pneumonoultramicroscopicsilicovolcanoconiosis succeeded electrophotomicrographically as the longest word in the English language.

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antidisestablishmentarianism

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He tidy tú

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Q: What is the longest word in history?
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