史上最长的英文单词是什么？

1913个字母，“色氨酸合成酶a蛋白质”(一种含有267种氨基酸酶)的化学名： methionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanyl-

glutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalyl-

prolyphenylalanylvalythreonylleucylglycylaspartylprolylglycylisoleucyl-

glutamylglutaminylserylleucyllysylisoleucylaspartylthreonylleucylisoleucyl-

glutamylalanylglycylalanylasparthlalanylleucylglutamylleucylglycylisoleucylprolyl-

phenylalanylserylaspartylprolylleucylalanylaspartylglycylprolylthreonylisoleucyl-

glutaminylaspfraginylalanylthreonylleucylarfinylalanylphenylalanylalanylalanyl-

glycylvalythreonylprolylalanylglutaminylcysteinylphenylalanylglutamylmethionylleu-

cylalanylleuoylisoleucylarginylglutaminyllysyhistidylprolylthreonylisoleucylprolyli-

soleucylglycylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalany-

lasparaginyllysyglycylisoleucylaspartylglutamylphenylalanylthrosylalanyl-

glutaminylcysteinylglutamyllysylvalylglycylvalylaspartylserylvalylleucylval-

ylalnylaspartylvalylprolylvalylglutaminylglutamylserylalanylprolylphenylalanylarginyl-

glutaminylalanylalanylleucylarginylhistidylasparaginyvalylalanylprolylisoleucyl-

prolylisoleucylphenylalanylisoleucylphenylalanylisoleucylcysteinylprolylproly-

laspartylalanylaspartylaspartylaspartylleucylleucylarginylglutaminylisoleucy-

lalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrosylleucylleucylsery-

larginylalanylglycylvalylthreonylglycylalanylglutamylasparainylarginylalanylalanylleucyl-

prolylleucylasparaginylhistidylleucylvalylalanyllysylleucyllysylglutamyltyrosylasparaginy-

lalanylalanylprolylprolylleucylglutaminylglgycylphenylalanylglycylisoleucylserylalanylproly-

laspartylglutaminylvalyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanylgly-

cylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoieucylisoleucylglutamyl-

glutaminylhistidylasparaginylisoleucylglutamylprolylglutamyllysylmethionylleucylalany-
lalanylleucyllysylvalylphenylalanylcalylglutaminylprolylmethionlysylalanylalanylthreony-larginylserine
因为你说要最长的，一楼的有12个，不符合你的要求

参考资料：

本回答被提问者采纳

根据牛顿字典世界上最长的英文字是``pneumonoultramicroscopicsilicovolcanoconiosis’

中文名为“色氨酸合成酶a蛋白质”..（一种含有267种氨基酸酶）的化学名：

methionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalylprolyphenylalanylvalythreonylleucylglycylaspartylprolylglycylisoleucylglutamylglutaminylserylleucyllysylisoleucylaspartylthreonylleucylisoleucylglutamylalanylglycylalanylasparthlalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylserylaspartylprolylleucylalanylaspartylglycylprolylthreonylisoleucylglutaminylaspfraginylalanylthreonylleucylarfinylalanylphenylalanylalanylalanylglycylvalythreonylprolylalanylglutaminylcysteinylphenylalanylglutamylmethionylleucylalanylleuoylisoleucylarginylglutaminyllysyhistidylprolylthreonylisoleucylprolylisoleucylglycylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalanylasparaginyllysyglycylisoleucylaspartylglutamylphenylalanylthrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylaspartylserylvalylleucylvalylalnylaspartylvalylprolylvalylglutaminylglutamylserylalanylprolylphenylalanylarginylglutaminylalanylalanylleucylarginylhistidylasparaginyvalylalanylprolylisoleucylprolylisoleucylphenylalanylisoleucylphenylalanylisoleucylcysteinylprolylprolylaspartylalanylaspartylaspartylaspartylleucylleucylarginylglutaminylisoleucylalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrosylleucylleucylserylarginylalanylglycylvalylthreonylglycylalanylglutamylasparainylarginylalanylalanylleucylprolylleucylasparaginylhistidylleucylvalylalanyllysylleucyllysylglutamyltyrosylasparaginylalanylalanylprolylprolylleucylglutaminylglgycylphenylalanylglycylisoleucylserylalanylprolylaspartylglutaminylvalyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanylglycylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoieucylisoleucylglutamylglutaminylhistidylasparaginylisoleucylglutamylprolylglutamyllysylmethionylleucylalanylalanylleucyllysylvalylphenylalanylcalylglutaminylprolylmethionlysylalanylalanylthreonylarginylserine

这个问题太简单了，不就是smile嘛。因为mile是公里的意思呀！