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PNEUMONOULTRAMICROSCOPICSILICOVOLCANOCONIOSIS = a lung disease caused by breathing in particles of siliceous volcanic dust. This is the longest word in any English dictionary. However, it was coined by Everett Smith, the President of The National Puzzlers' League, in 1935 purely for the purpose of inventing a new "longest word". The Oxford English Dictionary described the word as factitious. Nevertheless it also appears in the Webster's, Random House, andChambers dictionaries.

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14y ago
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13y ago

Methionylthreonylthreonylglutaminylarginyl........... Has 189,819 letters in it but is desputed to be a real word or not still today.

Pneumonoultramicroscopicsilicovolcanoconiosis has 45 letters in it and can be found in any dictionary. Longest word in a major dictionary.

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Q: What is the biggest word in the dictionary?
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