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1.
The full name of the tryptophan synthetase A protein, an enzyme with 267 amino acids, extends to 1,913 letters:
methionylglutaminylarginyltyrosylglutamylserylleucylphenylalanyla lanylglutaminylleucyllysylglutamylarginyllysylglutamylglycylalany lphenylalanylvalylprolylphenylalanylvalylthreonylleucylglycylaspa rtylprolylglycylisoleucylglutamylglutaminylserylleucyllysylisoleu cylaspartylthreonylleucylisoleucylglutamylalanylglycylalanylaspar tylalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylser ylaspartylprolylleucylalanylaspartylglycylprolylthreonyliso leucylglutaminylaspfraginylalanylthreonylleucylarginylalanylpheny lalanylalanylalanylglycylvalylthreonylprolylalanylglutaminylcyste inylphenylalanylglutamylmethionylleucylalanylleucylisoleucylargin ylglutaminyllysylhistidylprolylthreonylisoleucylprolylisoleucylgl ycylleucylleucylmethionyltyrosylalanylasparaginylleucylvalylpheny lalanylasparaginyllysylglycylisoleucylaspartylglutamylphenylalany ltyrosylalanylglutaminylcysteinylglutamyllysylvalylglycylva lylaspartylserylvalylleucylvalylalanylaspartylvalylprolylvalylglu taminylglutamylserylalanylprolylphenylalanylarginylglutaminylalan ylalanylleucylarginylhistidylasparaginylvalylalanylprolylisoleucy lphenylalanylisoleucylcysteinylprolylprolylaspartylalanylaspartyl aspartylaspartylleucylleucylarginylglutaminylisoleucylalanylseryl tyrosylglycylarginylglycyltyrosylthreonyltyrosylleucylleucylseryl arginylalanylglycylvalylthreonylglycylalanylglutamylasparag inylarginylalanylalanylleucylprolylleucylasparaginylhistidylleucy lvalylalanyllysylleucyllysylglutamyltyrosylasparaginylalanylalany lprolylprolylleucylglutaminylglycylphenylalanylglycylisoleucylser ylalanylprolylaspartylglutaminylvalyllysylalanylalanylisoleucylas partylalanylglycylalanylalanylglycylalanylisoleucylserylglycylser ylalanylisoleucylvalyllysylisoleucylisoleucylglutamylglutaminylhi stidylasparaginylisoleucylglutamylprolylglutamyllysylmethio nylleucylalanylalanylleucyllysylvalylphenylalanylvalylglutaminylp rolylmethion yllysylalanylalanylthreonylarginylserine.
if someone could give an example i would die
by The Computer Doc April 15, 2004
 
2.
Smiles--because there's a mile between both S'es.
My friend Tom smiles often.
by Mariah April 23, 2005
 
3.
There is a debate about the longest word in the English language; in my opinion it's floccinaucinihilipilificatious compared to the debate on antidisestablishmentarianism. Those with hippopotomonstrosesquippedaliophobia tend to avoid the subject. The longest word in the common English dictionary is pneumohoultramicroscopicsilicovolcanoko niosis, although in medical diaries and such methionylglutaminylarginyltyrosylglutam ylserylleucylphenylalanylalanylglutamin ylleucyllysylglutamylarginyllysylglutam ylglycylalanylphenylalanylvalylprolylph enylalanylvalylthreonylleucylglycylaspa rtylprolylglycylisoleucylglutamylglutam inylserylleucyllysylisoleucylaspartylth reonylleucylisoleucylglutamylalanylglyc ylalanylaspartylalanylleucylglutamylleu cylglycylisoleucylprolylphenylalanylser ylaspartylprolylleucylalanylaspartylgly cylprolylthreonylisoleucylglutaminylasp fraginylalanylthreonylleucylarginylalan ylphenylalanylalanylalanylglycylvalylth reonylprolylalanylglutaminylcysteinylph enylalanylglutamylmethionylleucylalanyl leucylisoleucylarginylglutaminyllysylhi stidylprolylthreoylisoleucylprolylisole ucylglycylleucylleucylmethionyltyrosyla lanylasparaginylleucylvalylphenylalanyl asparaginyllysylglycylisoleucylaspartyl glutamylphenylalanyltyrosylalanylglutam inylcysteinylglutamyllysylvalylglycylva lylaspartylserylvalylleucylvalylalanyla spartylvalylprolylvalylglutaminylglutam ylserylalanylprolylphenylalanylarginylg lutaminylalanylalanylleucylarginylhisti dylasparaginylvalylalanylprolylisoleucy lphenylalanylisoleucylcysteinylprolylpr olylaspartylalanylaspartylaspartylaspar tylleucylleucylarginylglutaminylisoleuc ylalanylseryltyrosylglycylarginylglycyl tyrosylthreonyltyrosylleucylleucylseryl arginylalanylglycylvalylthreonylglycyla lanylglutamylasparaginylarginylalanylal anylleucylprolylleucylasparaginylhistid ylleucylvalylalanyllysylleucyllysylglut amyltyrosylasparaginylalanylalanylproly lprolylleucylglutaminylglycylphenylalan ylglycylisoleucylserylalanylprolylaspar tylglutaminylvalyllysylalanylalanylisol eucylaspartylalanylglycylalanylalanylgl ycylalanylisoleucylserylglycylserylalan ylisoleucylvalyllysylisoleucylisoleucyl glutamylglutaminylhistidylasparaginylis oleucylglutamylprolylglutamyllysylmethi onylleucylalanylalanylleucyllysylvalylp henylalanylvalylglutaminylprolylmethion ylysylalanylalanylthreonylarginylserine reigns supreme. But in the science of deoxyribose nucleic acid (DNA) all amino acids have their own little tag. {eg. glutaminyl=C5H9N2O2 valyl=(CH3)2CHCH(NH2)CO} Therefore one strand of DNA could be lengthened out to an infinite amount of letters long.

The current longest accepted word in English dictionaries (above) is questioned also being as that it was coined by a man in 1935 simply for the purpose of creating a new longest word. Though pneumonoultramicroscopicsilicovolcanoco niosis does have a definition as a disease caused by inhalation of sulfuric dust in volcanic smoke, very prominent among mine workers and volcanic scientists.

As it is an open debate feel free to choose what you believe.
WARNING: Reading above "longest word" out loud may result in electroencephalographical complications.
by Ty4thVenom December 13, 2005
 
4.
The longest word in the English language according to Guinness is FLOCCINAUCINIHILIPILIFICATION. The lung disease one is the longest unnofficial word, cos it's a compound scientific term, and it's possible to make sceintific names stupidly long, like the 1700+ character one, but that's neverbeen in a dictionary.

The longest word entered in a dictionary anywhere is Swedish, and it's NORDOSTERSJOKUSTARTILLERIFLYGSPANINGSSIMULATORANLAGG-
NINGSMATERIELUNDERHALLSUPPFOLJNINGSSYSTEMDISKUSSIONS-
INLAGGSFORBEREDELSEARBETEN, which means "preparatory work on the contribution to the discussion on the maintaining system of support of the material of the aviation survey simulator device within the north-east part of the coast artillery of the Baltic."
Other fun long words - DONAUDAMPFSCHIFFAHRTSELEKTRIZITAETENHAUPTBETRIEBSWERKBAUUNTERBEAMTENGESELLSCHAFT
DIKETIDAKNYAHCASDIVERSIFIKASIELEKTROSTATIKKAN
KINDERCARNIVALSOPTOCHTVOORBEREIDINGSWERKZAAMHEDEN
by BlueMeanieUK January 06, 2004