How many letters are in the longest word in the English language?

Susie Webb

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The longest word in the Oxford dictionary is pneumonoultramicroscopicsilicovolcanoconiosis. It is 45 letters long, and it’s definition is a type of lung disease. There is another word that has 189,819 letters in it’s name, but there is some debate as to whether or not it is the longest word in the English dictionary. The word is a chemical name for titan, and some argue that it isn’t an actual word in the English language. Nonetheless, this incredibly lengthy word takes around three hours to pronounce!

Here is the 189,819 letter long word:


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