The longest word in English

This post turned out to be surprisingly popular, so I rewrote it to include not only the longest word but also a few other linguistic anomalies - a hill name 85 letters long for example. Happy reading...

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The longest word turned out to be a scientific one, a full name of a protein - Titin, also known as connectin. It is 189,819 letters long. Professional dictionary writers regard generic names of chemical compounds as verbal formula rather than as English words, so it is a bit disputable if this can be viewed as a true word. it is too long to post here, so I am posting a shorter one instead - this one is only 1185 letters long:

acetylseryltyrosylserylisoleucylthreonylserylprolylserylglutaminyl-

phenylalanylvalylphenylalanylleucylserylserylvalyltryptophylalanyl-

aspartylprolylisoleucylglutamylleucylleucylasparaginylvalylcysteinyl-

threonylserylserylleucylglycylasparaginylglutaminylphenylalanyl-

glutaminylthreonylglutaminylglutaminylalanylarginylthreonylthreonyl-

glutaminylvalylglutaminylglutaminylphenylalanylserylglutaminylvalyl-

tryptophyllysylprolylphenylalanylprolylglutaminylserylthreonylvalyl-

arginylphenylalanylprolylglycylaspartylvalyltyrosyllysylvalyltyrosyl-

arginyltyrosylasparaginylalanylvalylleucylaspartylprolylleucylisoleucyl-

threonylalanylleucylleucylglycylthreonylphenylalanylaspartylthreonyl-

arginylasparaginylarginylisoleucylisoleucylglutamylvalylglutamyl-

asparaginylglutaminylglutaminylserylprolylthreonylthreonylalanylglutamyl-

threonylleucylaspartylalanylthreonylarginylarginylvalylaspartylaspartyl-

alanylthreonylvalylalanylisoleucylarginylserylalanylasparaginylisoleucyl-

asparaginylleucylvalylasparaginylglutamylleucylvalylarginylglycyl-

threonylglycylleucyltyrosylasparaginylglutaminylasparaginylthreonyl-

phenylalanylglutamylserylmethionylserylglycylleucylvalyltryptophyl-

threonylserylalanylprolylalanylserine

I didn't even tried to read it or to pronounce it. This is however a perfectly real word and an example to the problems scientists have when they are out of words.

The longest word coined by a major author is a name of a fictional dish (183 letters):

Lopado­temacho­selacho­gameo­kranio­leipsano­drim­hypotrimmato­silphiokaraome-
lito­katakechymeno­kichl­epi­kossypho­phatto­perister­alektryon-
opte­kephallio­kinklo­peleio­lagoio­siraio­baphe­tragano­pterygon

For a long time it was the longest word known.

The longest officially recognized place name is a name of a hill in New Zealand (85 letters):

Taumatawhakatangihangakoauauotamateaturipukakapikimaungaho-
ronukupokaiwhenuakitanatahu

The name is often shortened to Taumata by the locals for ease of conversation. It translates roughly as "The summit where Tamatea, the man with the big knees, the climber of mountains, the land-swallower who traveled about, played his nose flute to his loved one".

Also the longest nontechnical word is (29 letters):

Floccinaucinihilipilification.

It is "the act or habit of estimating or describing something as worthless, or making something to be worthless by deprecation". This word is frequently used in maths and maths related subjects.
The is some disute about this word status - as of now wikipedia claims that the longest non coined and not technical word is (28 letters):

Antidisestablishmentarianism.

It is a political position that originated in nineteenth-century Britain, where antidisestablishmentarians were opposed to proposals to remove the Church of England's status as the state church of England forwarded principally by both Payne and Tuffin.)

Source - wikipedia.