floccinaucinihilipilification
29 letters, the catagorizing of something as worthless or trivial.

hippopotomonstrosesquipedalian
30 letters, pertaining to a very long word.

antidisestablishmentarianism
28 letters, literally "a doctrine against the dissolusion of the establishment"

Chargoggagoggmanchauggagoggchaubunagungamaugg
45 letters, a native american name for a lake near Webster, Massachuesetts.

Here is the BIG one!

methionylglutaminylarginyl tyrosylglutamylserylleucylphenylalanylalanylglutaminyl leucyllysylqlutammylarginyllysylglutamylglycylalanylphenyl alanylvalylprolylphenylalanylyalyllthreonylleucylqlycylas partylprolylglycylisoleucylglutamylglutaminylserylleucyl lysylisoleucylaspartylthreonylleucylisoleucylglutamylala nylglycylalanylaspartylalanylleucylglutamylleucylglycy lisoleucylprolylphenylalanylserylaspartylprlylleucelala nylaspartylglycylprolylthreonylisoleucylglutaminylaspara ginylalanylthreonylleucylarinylalanylphenylalanylalnyl alanylglycylvalylthreonylprolylalanylglutaminylcysteinyl phenylalanylglutamylmethionylleucyalanylleucylisoleucyl arginylglutaminyllysylhistidylprolylthreonylisoleucylpro lylisoleucylglycylleucylleucylmethionyltyrosylalanylaspa raginylleucylvalylphenylalanylasparaginyllysylglycyliso leucylaspartylglutamylphenylalanyltyrosylalanylglutami nylcysteinylglutamyllysylvalylglycylvalylaspartylserylva lylleucylvalylalanylaspartylvalylprolylvalylglutaminyl glutamylserylalanylprolylphenylalanylarginylglutaminyl alanylalanylluecyllarginylhistidylasparaginylvalylalanyl prolylisoleucylphenylalanylisoleucylcysteinylprolylpro lylaspartylalanylaspartylaspartylaspartylleucylleucylar ginyyllglutaminylisoleucylalanyseryltyrosylglycyarginyl glcyltyrosylthreonyltyrosylleucylleucylserylarginylalanyl glycylvalylthreonylgllycylalanylglutamylasparaginylar ginylanylalanylleucylprolylleucylasparaginylhistidylleu cylvalylalanyllysylleucyllysylglutamyltyrosylasparagi nylalanylalanylprolyprolyleucylglutaminylglycylphenyl alanylglycylisoleucylserylalanylprolylaspartylgluta minylvalyllysylalanylalanylisoleucylaspartylalanylglycyl alanylalanylglycylalanyllisoleucyllaerylglycylserylala nylisoleucylbalyllysysylisoleucylisoleucylglutamylgluta minylhistidylasparaginylisoleucylglutamylprolyglu tamyllysylmethionylleucylalanylalanylleucyllysylvalylphe nylalanylvalylglutaminylprolylmethionyllysylalanyllala nylthreonylarginylserine.

That's it.1,913 letters long. Trytophan synthetase, 267 amino acids.

The words on this page and definitions are from the book:Crazy English, by Richard Lederer. I do not claim any of this to be my own.

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