Definition of "pneumonoultramicroscopicsilicovolcanoconiosis" []

• A factitious disease of the lungs, allegedly caused by inhaling microscopic silicate particles originating from eruption of a volcano. (noun)

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• "The longest word in the English language, according to the Oxford English Dictionary, is pneumonoultramicroscopicsilicovolcanoconiosis."
• "The notes spelled out a very long word: pneumonoultramicroscopicsilicovolcanoconiosis."