Pneumonoultramicroscopicsilicovolcanoconiosis

Longest word in the English language published in a dictionary

Pneumono­ultra­micro­scopic­silico­volcano­coniosis is a 45-letter word coined in 1935 by the then-president of the National Puzzlers' League, Everett M. Smith. It has sometimes been used as a synonym for the occupational disease known as silicosis, but it should not be as most silicosis is not related to mining of volcanic dusts. It is the longest word in the English language published in a popular dictionary, Oxford Dictionaries, which defines it as "an artificial long word said to mean a lung disease caused by inhaling very fine ash and sand dust".

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