189.819 letters The word is a chemical name of titin, the longest known protein. The word would take 3.5 hours to say out The second and third longest English words have 1,909 and 182 letters respectively. Methionylalanylthreonylserylarginylglycylalanylserylarginylcysteinylproly- larginylaspartylisoleucylalanylasparaginylvalylmethionylglutaminylarginyl- leucylglutaminylaspartylglutamylglutaminylglutamylisoleucylvalylglutaminy- llysylarginylthreonylphenylalanylthreonyllysyltryptophylisoleucylasparagi- nylserylhistidylleucylalanyllysylarginyllysylprolylprolylmethionylvalylva- lylaspartylaspartylleucylphenylalanylglutamylaspartylmethionyllysylaspart- ylglycylvalyllysylleucylleucylalanylleucylleucylglutamylvalylleucylserylg- lycylglutaminyllysylleucylprolylcysteinylglutamylglutaminylglycylarginyla- rginylmethionyllysylarginylisoleucylhistidylalanylvalylalanylasparaginyli- soleucylglycylthreonylalanylleucyllysylphenylalanylleucylglutamylglycylar- ginyllysylisoleucyllysylleu...
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