which is the longest word in english? 中文

如果是脑筋急转弯，答案是：
Smiles 因为中间是 mile 两边无限延长
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如果是实际的单词，最长的是含1913个字母的单词
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：
methionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalylprolyphenylalanylvalythreonylleucylglycylaspartylprolylglycylisoleucylglutamylglutaminylserylleucyllysylisoleucylaspartylthreonylleucylisoleucylglutamylalanylglycylalanylasparthlalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylserylaspartylprolylleucylalanylaspartylglycylprolylthreonylisoleucylglutaminylaspfraginylalanylthreonylleucylarfinylalanylphenylalanylalanylalanylglycylvalythreonylprolylalanylglutaminylcysteinylphenylalanylglutamylmethionylleucylalanylleuoylisoleucylarginylglutaminyllysyhistidylprolylthreonylisoleucylprolylisoleucylglycylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalanylasparaginyllysyglycylisoleucylaspartylglutamylphenylalanylthrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylaspartylserylvalylleucylvalylalnylaspartylvalylprolylvalylglutaminylglutamylserylalanylprolylphenylalanylarginylglutaminylalanylalanylleucylarginylhistidylasparaginyvalylalanylprolylisoleucylprolylisoleucylphenylalanylisoleucylphenylalanylisoleucylcysteinylprolylprolylaspartylalanylaspartylaspartylaspartylleucylleucylarginylglutaminylisoleucylalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrosylleucylleucylserylarginylalanylglycylvalylthreonylglycylalanylglutamylasparainylarginylalanylalanylleucylprolylleucylasparaginylhistidylleucylvalylalanyllysylleucyllysylglutamyltyrosylasparaginylalanylalanylprolylprolylleucylglutaminylglgycylphenylalanylglycylisoleucylserylalanylprolylaspartylglutaminylvalyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanylglycylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoieucylisoleucylglutamylglutaminylhistidylasparaginylisoleucylglutamylprolylglutamyllysylmethionylleucylalanylalanylleucyllysylvalylphenylalanylcalylglutaminylprolylmethionlysylalanylalanylthreonylarginylserine
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词典中可以查到的最长单词45个字母
pneumonoultramicroscopicsilicovolcanoconiosis
[ \'nju:mEnEu ,vltrE-,maikrEs\' kCpik\'silikEvCl\'keinEu kEuni\'Eusis ]

意思：火山矽肺症

这个由45的字母所构成的单字，要在毫无规则可循的情况下，叫一个20岁以上，脑筋已经开始僵化的人记下来，实在非常困难。一般人看了只有猛摇头的份。所以，我们应该找出线索来帮助记忆。这个乍见十分冗长的单字，其实仔细观察可以发现是由几个部分构成。
pneumono …………「肺」
→ 这个单字可以衍生出pneumonia(肺炎)
ultra …………「超」
micro …………「微」
→ microscope(显微镜)
scopic …………「视」
silico …………「矽」→ silicon(矽)
volcano …………「火山」
coniosis …………「症」
只要将上述七个部分组合起来，就能了解这个字的字义，也就是「矽肺症」。

参考资料：http://zhidao.baidu.com/question/17624880.html

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