Who has the longest...

[sagacious]

Mile. Ba dum pssh.

OT: I can't think of anything that competes with that.

WIN.

OT: Alot of northern european languages' style allows the creation of long words that in english, would be broken up. I don't know what the longest word ever is, but it definetly isn't an english word.

 

[MR T3D]

y'all are familiar with this one, and it's moderately long:
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

 

[The_ModeRazor]

I do have a chemical word however:


1,185) ACETYL­SERYL­TYROSYL­SERYL­ISO­LEUCYL­THREONYL­SERYL­PROLYL­SERYL­GLUTAMINYL­PHENYL­ALANYL­VALYL­PHENYL­ALANYL­LEUCYL­SERYL­SERYL­VALYL­TRYPTOPHYL­ALANYL­ASPARTYL­PROLYL­ISOLEUCYL­GLUTAMYL­LEUCYL­LEUCYL­ASPARAGINYL­VALYL­CYSTEINYL­THREONYL­SERYL­SERYL­LEUCYL­GLYCYL­ASPARAGINYL­GLUTAMINYL­PHENYL­ALANYL­GLUTAMINYL­THREONYL­GLUTAMINYL­GLUTAMINYL­ALANYL­ARGINYL­THREONYL­THREONYL­GLUTAMINYL­VALYL­GLUTAMINYL­GLUTAMINYL­PHENYL­ALANYL­SERYL­GLUTAMINYL­VALYL­TRYPTOPHYL­LYSYL­PROLYL­PHENYL­ALANYL­PROLYL­GLUTAMINYL­SERYL­THREONYL­VALYL­ARGINYL­PHENYL­ALANYL­PROLYL­GLYCYL­ASPARTYL­VALYL­TYROSYL­LYSYL­VALYL­TYROSYL­ARGINYL­TYROSYL­ASPARAGINYL­ALANYL­VALYL­LEUCYL­ASPARTYL­PROLYL­LEUCYL­ISOLEUCYL­THREONYL­ALANYL­LEUCYL­LEUCYL­GLYCYL­THREONYL­PHENYL­ALANYL­ASPARTYL­THREONYL­ARGINYL­ASPARAGINYL­ARGINYL­ISOLEUCYL­ISOLEUCYL­GLUTAMYL­VALYL­GLUTAMYL­ASPARAGINYL­GLUTAMINYL­GLUTAMINYL­SERYL­PROLYL­THREONYL­THREONYL­ALANYL­GLUTAMYL­THREONYL­LEUCYL­ASPARTYL­ALANYL­THREONYL­ARGINYL­ARGINYL­VALYL­ASPARTYL­ASPARTYL­ALANYL­THREONYL­VALYL­ALANYL­ISOLEUCYL­ARGINYL­SERYL­ALANYL­ASPARAGINYL­ISOLEUCYL­ASPARAGINYL­LEUCYL­VALYL­ASPARAGINYL­GLUTAMYL­LEUCYL­VALYL­ARGINYL­GLYCYL­THREONYL­GLYCYL­LEUCYL­TYROSYL­ASPARAGINYL­GLUTAMINYL­ASPARAGINYL­THREONYL­PHENYL­ALANYL­GLUTAMYL­SERYL­METHIONYL­SERYL­GLYCYL­LEUCYL­VALYL­TRYPTOPHYL­THREONYL­SERYL­ALANYL­PROLYL­ALANYL­SERINE = Tobacco Mosaic Virus, Dahlemense Strain.
This word has appeared in the American Chemical Society's Chemical Abstracts and is thus considered by some to be the longest real word.

Awesome. Too bad it's I think a kind of chemical compound, being a protein and all.
And now I can't contribute
Hippopotamus?

 

[Wolfram23]

antidisestablishmentarianism is the longest one I know of... well, knew of.

meaning: it is a political position that originated in nineteenth-century Britain in opposition to proposals for the disestablishment of the Church of England, that is, to remove the Anglican Church's status as the state church of England, Ireland and Wales.

 

[Cherry Cola]

A long word you say?

Very well then.

WOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
*stops for a breather*
OOOOOOOOOOOOOOOOOOOOOOOORD

 

[WestMountain]

I'm surprised no one have mentioned the joke that the OP made in the title or maybe its just me with my dirty mind

OT: hypercontradiafragmavibrations, its the word for hickup :]

 

[ssgt splatter]

The fifth poster takes the cake.

 

[TheSquirrelisKing]

HUGE WALL OF TEXT WARNING - seriously

Apparently it's this:
EDIT: Aww spoiler done failed.

Anyway http://www.sarahmcculloch.com/luminaryuprise/longest-word.html

189,819 letters long

The sad thing is somewhere in the world, someone has probably memorized this...
*Edit* If you read it long enough, your brain shuts down and your eyes cross and it turns into a magic eye puzzle.

 

[Wizco]

The longest one in Dutch I can think of is 'Hottentottententententoonstellingen"

Displays of tents of the Hottentots, or Khoikhoi as they are also called. The Hottentots lived somewhere in current West-Kaap, South-Africa.

EDIT: Just googled a bit, apparantly my language is kind of messed up this way, but we can just keep on adding if we want to, so: 'Hottentottententententoonstellingsmakersopleidingsprogramma'

Program to train the creators of displays of tents of the Hottentots

Or: 'Hottentottententententoonstellingsmakersopleidingsprogrammaverantwoordelijke'

The one responsible of the program to train the creators of tents of the Hottentots

Or, just to be silly: 'Hottentottententententoonstellingsmakersopleidingsprogrammaverantwoordelijkeopleidingsverantwoordlijke'

The one responsible of the program to train the one responsible of the program to train the creators of displays of tents of the Hottentots.

Also, I'm currently studying Chemistry and we have to be able to correctly create such words as those above (only shorter, though) if given a structural drawing. It can be a pain...

 

[Nicolefranklin]

Just googled it, and sadly, the longest danish word is only 51 letters:
speciallægepraksisplanlægningsstabiliseringsperiode

I have no idea what exactly it means, as it translates directly into "special doctor practiceplanning stabilizing period", eh

 

[hotacidbath]

I know that antidisestablishmentarianism has already been said, but I just wanted to post it again since I'm proud of myself that I spelled it right on the first try.

 

[Marmalade]

Nordöstersjökustartilleriflygspaningssimulatoranläggningsmaterielunderhållsuppföljningssystemdiskussionsinläggsförberedelsearbeten.
130 words.

I think it's something about an airplane simulator or something.
By the way the language is swedish.

 

[Aggressor and Usurper]

The Sunn O))) song Big Church's subtitle is "Megszentségteleníthetetlenségeskedéseitekért". Which is pretty cool.

 

[pffh]

Vaðlaheiðarvegavinnumannamatráðskonuskúrsútidyrahurðarlyklakippuhringssamskeyti

Here you go an Icelandic word. I can make it a lot longer by making it more and more specific but I don't think I need to.

 

[Deadlock Radium]

Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch

It's the name of a town in Wales.

Actually, it's a train station.

The original name of the capital of Thailand:

Spoiler: Now known as Bangkok

Krungthepmahanakonbovornartanakosinmahintahayattamahadilokpopnoparatrachaniboriomudomratchkanivetmahasatana-
monpimanavernsahitsakatattiavisnukamprasit.

 

[Cgull]

Mile. Ba dum pssh.

I see your 'Mile' and raise you 'Smiley'. There is now a mile between the first and last letters. It's a small win, but I'm happy with it.

In all seriousness, nothing I can think of will beat the original word.

 

[Deathsquirt]

Nordöstersjökustartilleriflygspaningssimulatoranläggningsmaterielunderhållsuppföljningssystemdiskussionsinläggsförberedelsearbeten.
130 words.

I think it's something about an airplane simulator or something.
By the way the language is swedish.

Rough translation: Preparatory work for submissions of discussion regarding a system for monitoring the maintenance of equipment for an air surveillance simulator of the coastal artillery in the northern Baltic Sea.

 

[Lemon Of Life]

I just found this Greek word coined by the playwright Aristophanes and it's Lopadotemakhoselakhogameokranioleipsanodrimypotrimmatosilphiokarabomelitokatakekhymenokikhlepikossyphophattoperister-alektryonoptokephalliokigklopeleiolagōiosiraiobaphētraganopterýgōn
and the fear of long words is called: hippopotomonstrosesquipedaliophobia
I love irony

Darn, was just about to do this. It's a fictional dish btw. Ha.

 

[Nyffenschwander]

Nordöstersjökustartilleriflygspaningssimulatoranläggningsmaterielunderhållsuppföljningssystemdiskussionsinläggsförberedelsearbeten.
130 words.

I think it's something about an airplane simulator or something.
By the way the language is swedish.

Rough translation: Preparatory work for submissions of discussion regarding a system for monitoring the maintenance of equipment for an air surveillance simulator of the coastal artillery in the northern Baltic Sea.

I didn't think it would come to this that soon, but I have to accept defeat.
Measly 74 letters in mine...

 

[Ophiuchus]

Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch

It's the name of a town in Wales.

Actually, it's a train station.

Half right. The name sign that's become such a tourist attraction is at a train station, granted, but the station is in the village of the same name, usually shortened to Llanfairpwllgwyngyll or Llanfair PG for practical reasons.

There's a good reason why lexicographers don't generally accept technical terms (like that one that's nearly 190,000 letters, for example) - they can be extended almost infinitely by adding arbitrary terms, at which point it's termed as a 'verbal formula' rather than a word. Place names don't really count either. Then there's languages in which words can be greatly lengthened by adding arbitrary syllables and words to make big compound words, which don't really count either - Hungarian is a good example, since someone mentioned the Sunn O))) song and it was the first language in which I saw it done thanks to my friend who studied it at university, but I think it works roughly the same in Finnish, and seems to in Dutch and Swedish if the examples in this thread are anything to go by.

It's at roughly this point where I realise I should've studied lingustics instead of my current waste of time degree, it's clear where my real interest lies.