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Is commonly considered to be the longest word in the english language, however the longest word is actually the scientific name for titin. Both of these words are very medical/scientific so you are unlikely to find them in a language dictionary - especially not the scientific name for titin because it is One hundred and eighty nine thousand, eight hundred and nineteen (189'819) letters long. Pneumonoultramicroscopicsilicovolcanoconiosis is a lung disease caused by inhaling too much volcanic ash, or other rock containing similar compounds.
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