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 in any single gene.
Whatever the case, I can't recommend watching the whole thing unless you really want to know if it's possible to die of boredom.
Hit the jump for the video if you're tired of watching paint dry and ready for some REAL excitement in your life.
The full chemical name of the protein Titin is HERE.
