The Biggest Word You've Ever Heard

[ITADAKIMASU NOM NOM]

Post the biggest, longest word you can think of. It has to be a real word, and you must post the definition, that way we know what the hell it means.

Here's mine:

HEXAKOSIOIHEXEKONTAHEXAPHOBIA.

It's the fear of the number 666.  

[S a y u r i S u m i s u]

XD What a long word... XD
Hmm, for me it's Antidisestablishmentarianism.
XD Funny thing is, I heard it from a song. XD!  

[Brookshire]

Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu

(Its the Māori name for a hill in New Zealand according to wikipedia. It was in a Mountain Dew commercial. rofl )  

[Serenity Reed]

Honorificabilitudinitatibus. (Off the top of my head)
Honorificabilitudinitatibus as copied from... somewhere.

Proof that I am a grammar Nazi.  

[Garynook]

zandzeepsodemineraalwatersteenstralen. It is dutch for GTFO!  

[desy1156]

The longest word I've ever seen fills like half a page of a regular white paper, Arial, 10pt font. It's a chemical formula with a bunch of sulfur all around.

Now, longest word I can pronounce and spell correctly:
Hippopotomonstrosesquippedaliophobia
Fear of long words 3nodding [I love that word whee ]  

[Reinbow Chi Tea]

Paraskavedekatriaphobia - Fear of Friday the 13th

 

[dragonboy30303]

Pneumonoultramicroscopicsilicovolcanoconiosis

a factitious word alleged to mean 'a lung disease caused by the inhalation of very fine silica dust causing inflammation in the lungs.