The word antidisestablishmentarianism is the longest “normal” word in the English language. That is to say it’s a word that isn’t a medical term, like for example: hippopotomonstrosesquippedaliophobia. Ironically, this is actually the fear of long words. Maybe they should have made it shorter.
However, there is one word (if you could even call it a word) that blows away all the competition for the Worlds Longest Word Lifetime Achievement Award. I found it on this website while searching the intarwebs for long words.
Drum roll please….
methionylglutaminylarginyltyrosylglutamylserylleucyl phenylalanylalanylglutaminylleucyllysylglutamylarginyl lysylglutamylglycylalanylphenylalanylvalylprolylphenyl alanylvalylthreonylleucylglycylaspartylprolylglycylisol eucylglutamylglutaminylserylleucyllysylisoleucylaspartyl threonylleucylisoleucylglutamylalanylglycylalanylaspartyl alanylleucylglutamylleucylglycylisoleucylprolylphenyl alanylserylaspartylprolylleucylalanylaspartylglycylprolyl threonylisoleucylglutaminylasparaginylalanylthreonylleucyl arginylalanylphenylalanylalanylalanylglycylvalylthreonyl prolylalanylglutaminylcysteinylphenylalanylglutamyl methionylleucylalanylleucylisoleucylarginylglutaminyllysyl histidylprolylthreonylisoleucylprolylisoleucylglycylleucyl leucylmethionyltyrosylalanylasparaginylleucylvalylphenyl alanylasparaginyllysylglycylisoleucylaspartylglutamylphenyl alanyltyrosylalanylglutaminylcysteinylglutamyllysylvalyl glycylvalylaspartylserylvalylleucylvalylalanylaspartylvalyl prolylvalylglutaminylglutamylserylalanylprolylphenylalanyl arginylglutaminylalanylalanylleucylarginylhistidylasparaginyl valylalanylprolylisoleucylphenylalanylisoleucylcysteinyl prolylprolylaspartylalanylaspartylaspartylaspartylleucyl leucylarginylglutaminylisoleucylalanylseryltyrosylglycyl arginylglycyltyrosylthreonyltyrosylleucylleucylserylarginyl alanylglycylvalylthreonylglycylalanylglutamylasparaginyl arginylalanylalanylleucylprolylleucylasparaginylhistidyl leucylvalylalanyllysylleucyllysylglutamyltyrosylasparaginyl alanylalanylprolylprolylleucylglutaminylglycylphenylalanyl glycylisoleucylserylalanylprolylaspartylglutaminylvalyllysyl alanylalanylisoleucylaspartylalanylglycylalanylalanylglycyl alanylisoleucylserylglycylserylalanylisoleucylvalyllysylisol eucylisoleucylglutamylglutaminylhistidylasparaginylisoleucyl glutamylprolylglutamyllysylmethionylleucylalanylalanylleucyl lysylvalylphenylalanylvalylglutaminylprolylmethionyllysylalan
ylalanylthreonylarginylserine
This nearly 2,000 letter-long monstrosity (1,913 words to be exact) is the name of some protein. Technically it’s not a word, since who the fuck could ever hope to pronounce that?
Random Misanthrope 
It may not be a word but I should think it’s probably an ingredient in Twinkies.
I always thought floccinaucinihilipilification was the longest normal word, which means an act or habit estimated as worthless….mind you I have lost count so many times that antidisestablishmentarianism could very well be longer.
Counting the letters is such a pain the arse, isn’t it? I tried and lost count several times. Both words look about equal in letter-count to me, anyway.
I’ve received essays from students that were shorter than that “word.”
That’s not a word, it’s a protein baby!