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World Longest English Word So, the longest word in English's as follows. Oh you don't believe us, then check out the Wikipedia which provided this information.  https://en.wiktionary.org/wiki/Appendix:Protologisms/Long_words/Titin methionyl­threonyl­threonyl­glutaminyl­alanyl­prolyl­threonyl­phenylalanyl­threonyl­glutaminyl­prolyl­leucyl­glutaminyl­seryl­valyl­valyl­valyl­leucyl­glutamyl­glycyl­seryl­threonyl­alanyl­threonyl­phenylalanyl­glutamyl­alanyl­histidyl­isoleucyl­seryl­glycyl­phenylalanyl­prolyl­valyl­prolyl­glutamyl­valyl­seryl­tryptophyl­phenylalanyl­arginyl­aspartyl­glycyl­glutaminyl­valyl­isoleucyl­seryl­threonyl­seryl­threonyl­leucyl­prolyl­glycyl­valyl­glutaminyl­isoleucyl­seryl­phenylalanyl­seryl­aspartyl­glycyl­arginyl­alanyl­lysyl­leucyl­threonyl­isoleucyl­prolyl­alanyl­valyl­threonyl­lysyl­alanyl­asparaginyl­seryl­glycyl­arginyl­tyrosyl­seryl­leucyl­lysyl­alanyl­threonyl­asparaginyl­glycyl­seryl­glycyl­glutaminyl­alanyl­threonyl­seryl­threonyl­alanyl­glutamy...