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到底哪个单词是世界上最长的单词，相信不少人都有这个困惑，于是现在谜底这样揭开了！
各个领域造就的最长单词不一而论，大部分情况下公认最长的单词是已知最大蛋白——肌联蛋白的IUPAC名，由189,819个字母组成，从Methionylthreonylthreonylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminylleucyllysylglutamylarginyllysyl…开始到…glutamylasparaginylglutaminylglutaminylserylglutamylasparaginylglutaminylglutaminylserxisoleucine结束，大约需要3小时读完。[1]
排除这个单词后，其次是：
pneumonoultramicroscopicsilicovolcanoconiosis (共有45个字母)
[ˈnju:mənəuˌʌltrəˌmaikrəsˈkɔpikˈsilikəvɔlˈkeinəukəuniˈəusis]
[医]硅酸盐沉着病,矽肺病
pneumono- (of lung)
ultra- (beyond)
micro (very small)
scopic- (of viewing or observing)
silico- (of silicon)
volcano
coni- ( koni, of dust)
osis-(forming the name of a disease)
[1] 该单词完整版—— Methionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminylleucyllysylglutamylarginyllysylglutamylglycylalany
lphenylalanylvalylprolyphenylalanYlvalythreonylleucylglycylaspartylprolylglycylisoleucylglutamylglutaminylsErylleucyllysylisoleucylaspa
rtylthreonylleucylIsoleucylglutamylalanylglycylalanylasparthlalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylseRylaspartylpr
olylleucylalanylaspartylglycylpRolylthreOnylisoleucylglutaminylasPfraginylalanylthreonylleucylarfinylalanylphenylalanylalanylalanylglyc
ylvalythreonylprolylalanylglutaminylcysteinylphenylalanylglutamylmethionylleucylalanylleuOylisoleucylarginylglutaminyllysyhistidylprol
ylthreonylisoleucylprolylisoleucylglycylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalanylasparaginyllysyglycylisoleucylas
partylglutamylphenylalanylthrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylaspartylserylvalylleucylvalylalnylaspartylvalylprol
ylvalylglUtaminylglutamylserylalanylprolylphenylalanylarginylglutaminylalanylalanylleucylarginylhistidylasparaginyvalylalanylprolyliso
leucylprolylisoleucylphenylalanylisoleucylphenylalanylisoleucylcysteinylprolylprolylaspartylalanylaspartylaspartylaspartylleucylleucyla
rginylglutaminylisoleucylalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrOsylleucylleucylserylarginylalanylglycylvalylthreonylglycyl
alanylglutamYlasparainylarginylalanylalanylleucylprolylleucylasparaginylhistidylleucylValylalanyllysylleucyllysylglutamyltyrosylaspar
aginylalanylalanylprolylprolylleucylglutaminylglgycylphenylalanylglycylisoleucylserylalanylprolylaspartylglutaminylvalyllysylalanylalan
ylisoleucylaspartylalanylglycylalanylalanylglycylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoIeucylisoleucylglutamylgluta
minylHistidylasparaginyliSoleucylglutamylprolylglutamyllysylmethionylleucylalanylalanylleucyllysylvalylphenylalanylcalylglutaminylp
rolylmethionlysylalanylalanylthreon——“色氨酸合成酶A蛋白质”(一种含有267种氨基酸酶)的化学名。
本文来源：http://www.jxsbsh.com/zhishidaquan/338809/
