A Word of Almost Two Myriad Letters

"The Most Horrible English Words"

"And you thought your vocabulary was good? Try these words on for size."

From Honorificabilitudinitatibus to a monster with almost 2,000 letters, referring "to 'Tryptophan synthase a protein', a chemical name for a substance that contains 267 kinds of amino acid enzymes." That's what the author says, anyway.

Somehow, I don't think these words will come up very often in everyday conversation.