longest word in the english dictionary

The longest word is "smiles" because there is a mile between the S's.

Seriously, what's a word?  What's your metric?  And what's "the English dictionary"?

/km

Mr.Dictionary wrote:

The longest words in the Oxford English Dictionary are Antidisestablishmentarianism, Floccinaucinihilipilification, and my favorite Pneumonoultramicroscopicsilicovolcanoconiosis. Pronunsiation: Anti dis establishment arianism Flocci nauci ni hilip ilification pneumo ultra microscopic silico volcano con iosis

See this from Wikipedia:
However, the more serious problem is that the word was originally intended as a hoax: In Word Ways: The Journal of Recreational Linguistics, in several separate articles (May 1985, pp. 95-96; November 1986, pp. 205-206; May 1987, p. 82; November 1989, p. 205 ^[1]), researchers discovered that the word was invented in 1935 by Everett M. Smith, president of the National Puzzlers' League, at their annual meeting. The word occurred in a newspaper headline about the meeting, after which it was picked up by an author of puzzle books. Members of the National Puzzlers' League then campaigned to have it included in major dictionaries, eventually succeeding with the Oxford English Dictionary and Webster's Second. Research into medical literature prior to 1935 has failed to find the word in the dictionary. It has since been used, albeit sparingly

Actually, its pneumonultramicroscopicsilicovolcanoconiosis at 45 letters. Its a rare lung disease caused by a fine silico dust found in some volcanoes.

i don't know?