What is the longest English word?

Pneumonoultramicroscopicsilicovolcanoconiosis is 45 letters long and according to the Oxford English Dictionary, “a word alleged to mean ‘a lung disease caused by the inhalation of volcanic ash, causing inflammation in the lungs.’”

Pneumonoultramicroscopicsilicovolcanoconiosis may be the longest word in the dictionary, but we think Supercalifragilisticexpialidocious will always be our favorite longest word to sing! It’s 34 letters long and according to the 1964 Walt Disney film, Mary Poppins, it is defined as “what you say when you don’t know what to say”.

For more crazy, long words that most of us will never use in our lifetimes and more info on Pneumono-blah-blah-blah go to:

http://en.wikipedia.org/wiki/Longest_word_in_English