The longest word is Titin, which is a chemical compound, whose full name has 189,819 letters. It is not included in the dictionary – few lexicographers accept chemical formulae as words. But when people go round Googling “What’s the longest word in the English language?”, they don’t really care if it’s a “real” word or not. Titin is the largest known protein. Furthermore the gene for titin contains the largest number of exons (363) discovered...
