What is the longest word in the dictionary?

Question: What is the longest word in the dictionary?

The longest word in the English dictionary is pneumonoultramicroscopicsilicovolcanoconiosis, which is a lung disease caused by the inhalation of very fine silica particles. It has 45 letters.

However, there is also a word that is technically longer than pneumonoultramicroscopicsilicovolcanoconiosis, but it is not a word in the traditional sense. The word is methionylthreonylthreonylglutaminylarginyl...isoleucine, which is the chemical name for the protein titin. It has 189,819 letters.

Titin is the largest known protein in the human body, and its chemical name is so long because it includes the names of all of the individual amino acids that make up the protein.

So, which word is the longest? It depends on how you define "word." If you define "word" as a string of letters that has meaning, then pneumonoultramicroscopicsilicovolcanoconiosis is the longest word in the dictionary. However, if you define "word" as any string of letters, then methionylthreonylthreonylglutaminylarginyl...isoleucine is the longest word.

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