The longest English word

Longest English word in the dictionary:
Pneumonoultramicroscopicsilicovolcanocon (40 letters)

Longest English word not in the dictionary:
1. Methionylthreonylthreonylglutaminylarg (30 letters)

2. Methionylthreonylthreonylglutaminylala...
ylglutaminylprolylleucylglutaminylsery...
lserylthreonylalanylthreonylphenylalan...
rylglycylphenylalanylprolylvalylprolyl...
lanylarginylaspartylglycylglutaminylva...
nylleucylprolylglycylvalylglutaminylis...
ylglycylarginylalanyllysylleucylthreon...
llysylalanylasparaginylserylglycylargi...
eonylasparaginylglycylserylglycylgluta...
nylglutamylleucylleucylvalyllysylalany...
asparaginylphenylalanylvalylglutaminyl...
ylthreonylvalylarginylglutaminylglycyl...
utaminylvalylarginylvalylthreonylglycy...
lylvalyllysylphenylalanyltyrosylarginy...
cylglutaminylserylserylleucylaspartylp...
glutaminylglutamylglycylaspartylleucyl...
anylglutamylalanyltyrosylprolylglutamy...
serylvalylasparaginylalanylthreonylasp...
ylthreonylserylthreonylalanylglutamyll...
tamylglutamylglutamylvalylprolylalanyl...
eucylvalylserylthreonylalanylglutaminy...
glutaminylthreonylarginylisoleucylglut...
ylhistidylphenylalanylaspartylalanylar...
lylglutamylmethionylvalylisoleucylaspa...
nylglutaminylleucylprolylhistidyllysyl...
lprolylprolyllysylprolyllysylserylargi...
erylisoleucylalanylalanyllysylalanylgl...
ylglutaminylserylprolylserylprolylisol...
lprolylvalylarginylhistidylvalylarginy...
lylvalylarginylserylvalylserylprolylal...
onylserylprolylisoleucylarginylserylva...
thionylarginyllysylthreonylglutaminyla...
ylglycylprolylglutamylvalylprolylproly...
tamylglycyltyrosylvalylalanylserylsery...
ylarginylglutamylthreonylthreonylleucy...
minylisoleucylarginylthreonylglutamylg...
cylarginyltyrosylglycylvalylglutaminyl...
eucylserylglycylalanylalanylglycylalan...
serylalanylseryltyrosylalanylalanylglu...
lalanyllysylglutamylvalyllysylglutamin...
lanylalanylvalylalanylthreonylvalylval...
lalanylarginylvalylarginylglutamylprol...
tamylglutaminylthreonylalanylglutaminy...
eonylalanylvalylhistidylisoleucylgluta...
glutaminylvalylarginyllysylglutamylala...
threonyllysylvalylvalylvalylalanylalan...
lutaminylglutamylleucyllysylserylargin...
leucylthreonylthreonyllysylglutaminylg...
alylthreonylhistidylglutamylglutaminyl...
ylglutamyllysylthreonylphenylalanylval...
ylalanylalanyllysylalanyllysylglutamyl...
oleucylserylglutamylglutamylisoleucylt...
taminylvalylthreonylglutaminylglutamyl...
ylthreonylarginyllysylthreonylvalylval...
nylthreonylprolyllysylvalyllysylglutam...
larginylglycylarginylglutamylglycyliso...
lutamylglutaminylvalylglutaminylisoleu...
ethionylarginyllysylglutamylalanylglut...
hreonylisoleucylalanylvalylalanylthreo...
utaminylglutamylthreonylisoleucylleucy...
onylmethionylalanylthreonylarginylglut...
utaminylvalylthreonylhistidylglycyllys...
lalanylglutamylalanylvalylalanylthreon... (189,819 letters)