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PNEUMONO­ULTRA­MICRO­SCOPIC­SILICO­VOLCANO­CONIOSIS is the longest word in the Chambers, Webster's and Random House dictionaries. It is seen by some other dictionaries as a joke or "made up word purely for the purpose of inventing the longest word".

The meaning of this word is "a lung disease caused by breathing volcanic dust".

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Q: What is the longest word in the Chambers Dictionary?
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