No.
The longest is a word from biology that consists of about 1900 letters, though it doesn't appear in dictionaries (think why
![Smile [:)]](/emoticons/emotion-1.gif)
)
There is another word that was found is one of the Shakespeare's books and consists of 45 letters. I will wonder if it appears in any dictionary as well as the first one.
There is another word that does appear in dictionaries - 27 letters, as far as I remember, though yours word is 34 letters (and doesn't appear in my dictionary)