ACETYLSERYLTYROSYLSERYLISOLEUCYLTHREONYLSERYLPROLYLSERYLGLUTAMINYLPH ENYLALANYLVALYLPHENYLALANYLLEUCYLSERYLSERYLVALYLTRYPTOPHYLALANYLASPARTYLPROLYLISOLEUCYL GLUTAMYLLEUCYLLEUCYLASPARAGINYLVALYLCYSTEINYLTHREONYLSERYLSERYLLEUCYLGLYCYLASPARAGINYLG LUTAMINYLPHENYLALANYLGLUTAMINYLTHREONYLGLUTAMINYLGLUTAMINYLALANYLARGINYLTHREONYLTHREONYLG LUTAMINYLVALYLGLUTAMINYLGLUTAMINYLPHENYLALANYLSERYLGLUTAMINYLVALYLTRYPTOPHYLLYSYLPROLYLP HENYLALANYLPROLYLGLUTAMINYLSERYLTHREONYLVALYLARGINYLPHENYLALANYLPROLYLGLYCYLASPARTYLVAL YLTYROSYLLYSYLVALYLTYROSYLARGINYLTYROSYLASPARAGINYLALANYLVALYLLEUCYLASPARTYLPROLYLLEUCY LISOLEUCYLTHREONYLALANYLLEUCYLLEUCYLGLYCYLTHREONYLPHENYLALANYLASPARTYLTHREONYLARGINYLAS PARAGINYLARGINYLISOLEUCYLISOLEUCYLGLUTAMYLVALYLGLUTAMYLASPARAGINYLGLUTAMINYLGLUTAMINYLSERY LPROLYLTHREONYLTHREONYLALANYLGLUTAMYLTHREONYLLEUCYLASPARTYLALANYLTHREONYLARGINYLARGINYL VALYLASPARTYLASPARTYLALANYLTHREONYLVALYLALANYLISOLEUCYLARGINYLSERYLALANYLASPARAGINYLISOL EUCYLASPARAGINYLLEUCYLVALYLASPARAGINYLGLUTAMYLLEUCYLVALYLARGINYLGLYCYLTHREONYLGLYCYLLEUC YLTYROSYLASPARAGINYLGLUTAMINYLASPARAGINYLTHREONYLPHENYLALANYLGLUTAMYLSERYLMETHIONYLSERYL GLYCYLLEUCYLVALYLTRYPTOPHYLTHREONYLSERYLALANYLPROLYLALANYLSERINE
(This word has appeared in the American Chemical Society's Chemical Abstracts and is thus considered by some to be the longest real word.) 
This is the chemical name of the largest known protein. It is an astonishing 189,819 letters long. However it is purely a technical term and though written in English it isn't a "dictionary" term and thus the first answerer is the most correct
Methionylthreonylthreonylglutaminylala…
ylglutaminylprolylleucylglutaminylsery…
lserylt hreonylalanylthreonylphenylalan…
rylglycylphenylalanylprolylvalylprolyl…
lanylarginylaspartylglycy lglutaminylva…
nylleucylprolylglycylvalylglutaminylis…
ylglycylarginylalanyllysylleucylthreon…
ll ysylalanylasparaginylserylglycylargi…
eonylasparaginylglycylserylglycylgluta…
nylglutamylleucylleu cylvalyllysylalany…
asparaginylphenylalanylvalylglutaminyl…
ylthreonylvalylarginylglutaminylglycyl …
utaminylvalylarginylvalylthreonylglycy…
lylvalyllysylphenylalanyltyrosylarginy…
cylglutaminylse rylserylleucylaspartylp…
glutaminylglutamylglycylaspartylleucyl…
anylglutamylalanyltyrosylprolylgl utamy…
serylvalylasparaginylalanylthreonylasp…
ylthreonylserylthreonylalanylglutamyll…
tamylgluta mylglutamylvalylprolylalanyl…
eucylvalylserylthreonylalanylglutaminy…
glutaminylthreonylarginyliso leucylglut…
ylhistidylphenylalanylaspartylalanylar…
lylglutamylmethionylvalylisoleucylaspa…
nylgl utaminylleucylprolylhistidyllysyl…
lprolylprolyllysylprolyllysylserylargi…
erylisoleucylalanylalan yllysylalanylgl…
ylglutaminylserylprolylserylprolylisol…
lprolylvalylarginylhistidylvalylarginy…
lylvalylarginylserylvalylserylprolylal…
onylserylprolylisoleucylarginylserylva…
thionylarginyllysy lthreonylglutaminyla…
ylglycylprolylglutamylvalylprolylproly…
tamylglycyltyrosylvalylalanylserylse ry…
ylarginylglutamylthreonylthreonylleucy…
minylisoleucylarginylthreonylglutamylg…
cylarginyltyr osylglycylvalylglutaminyl…
eucylserylglycylalanylalanylglycylalan…
serylalanylseryltyrosylalanylal anylglu…
lalanyllysylglutamylvalyllysylglutamin…
lanylalanylvalylalanylthreonylvalylval…
lalanyla rginylvalylarginylglutamylprol…
tamylglutaminylthreonylalanylglutaminy…
eonylalanylvalylhistidylis oleucylgluta…
glutaminylvalylarginyllysylglutamylala…
threonyllysylvalylvalylvalylalanylalan…
lut aminylglutamylleucyllysylserylargin…
leucylthreonylthreonyllysylglutaminylg…
alylthreonylhistidylg lutamylglutaminyl…
ylglutamyllysylthreonylphenylalanylval…
ylalanylalanyllysylalanyllysylglutamyl…
oleucylserylglutamylglutamylisoleucylt…
taminylvalylthreonylglutaminylglutamyl…
ylthreonylarginy llysylthreonylvalylval…
nylthreonylprolyllysylvalyllysylglutam…
larginylglycylarginylglutamylglycy liso…
lutamylglutaminylvalylglutaminylisoleu…
ethionylarginyllysylglutamylalanylglut…
hreonylisol eucylalanylvalylalanylthreo…
utaminylglutamylthreonylisoleucylleucy…
onylmethionylalanylthreonylar ginylglut…
utaminylvalylthreonylhistidylglycyllys…
lalanylglutamylalanylvalylalanylthreon…
i found it on google it must be true
anybody care to count the letters
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