字母最长的单词是什么

　　我们从初中或者更早开始就学习了英语，那么大家知道英语字母中最长的单词是什么么?下面由学习啦小编帮大家整理资料。

　　世界上最长的单词共189819个字母，读完需三个多小时

　　肌联蛋白这个词在中文里只有四个字啊四个字，而它的英文学名有多少个字母?十八万九千八百一十九个!对，你没看错，就是189819个字母!这么坑爹的单词是怎么诞生的?这就要从IUPAC命名法说起了。

　　这个世界上有一个名叫International Union of Pure and Applied Chemistry(国际纯粹与应用化学联合会)的组织，它最有名的工作就是定义化学等领域的专有名词。它出过一本“蓝宝书”(你没看错，它的外号就是The Blue Book)IUPAC Nomenclature of Organic Chemistry，也就是《IUPAC有机化学命名法》。

　　理科狗们在高中和大学阶段一定被系统命名法折磨过吧?想想2，2，5-三甲基己烷之类的东东。这就是IUPAC命名法的中文版。如果翻译成英文，三甲基己烷的单词长达15个字母trimethylhexane。你以为这就算长单词?呵呵，请看“孟二醇”三个字的英文版：2-hydroxy-α,α,4-trimethylcyclohexanemethanol。这个单词有多长?数学不好+密集恐惧症的小编已经数不过来了。

　　因此，一旦遇上某些链啊、基啊特别多的化合物，它的名称也就长的丧心病狂。骨骼肌中含有一种名叫肌联蛋白的蛋白质，它有25000多个氨基端。这直接导致它的学名成为最长的英文单词，长度为189819个字母!

　　这直接导致了IUPAC的蓝宝书从未发行过纸质版本。

　　Methionylthreonylthreonylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminyl

　　leucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalylprolylphenylalanylvalylthreony

　　lleucylglycylaspartylprolylglycylisoleucylglutamylglutaminylserylleucyllysylisoleucylaspartylthreonylleucy

　　lisoleucylglutamylalanylglycylalanylaspartylalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylse

　　rylaspartylprolylleucylalanylaspartylglycylprolylthreonylisoleucylglutaminylasparaginylalanylthreonylle

　　ucylarginylalanylphenylalanylalanylalanylglycylvalylthreonylprolylalanylglutaminylcy

　　steinylphenylalanylglutamylmethionylleucylalanylleucylisoleucylarginylglutaminyllysylhistidylprolylthreon

　　ylisoleucylprolylisoleucylglycylleucylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalanylasparaginy

　　llysylglycylisoleucylaspartylglutamylphenylalanyltyrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylas

　　partylserylvalylleucylvalylalanylaspartylvalylprolylvalylglutaminylglutamylserylalanylprolylphenylalanylarginylglutam

　　inylalanylalanylleucylarginylhistidylasparaginylvalylalanylprolylisoleucylphenylalanylisoleucylcysteinylprolylprolylas

　　partylalanylaspartylaspartylaspartylleucylleucylarginylglutaminylisoleucylalanylseryltyrosylglycylarginylglycyltyrosy

　　lthreonyltyrosylleucylleucylserylarginylalanylglycylvalylthreonylglycylalanylglutamylasparaginylarginylalanylalanylleu

　　cylprolylleucylasparaginylhistidylleucylvalylalanyllysylleucyllysylglutamyltyrosylasparaginylalanylalanylprolylprolyll

　　eucylglutaminylglycylphenylalanylglycylisoleucylserylalanylprolylaspartylglutaminylvalyllysylalanylalanylisoleucylasp

　　artylalanylglycylalanylalanylglycylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoleucylisoleucylglutamylglut

　　aminylhistidylasparaginylisoleucylglutamylprolylglutamyllysylmethionylleucylalanylalanylleucyllysylvalylphenylalanyl

　　valylglutaminylprolylmethionyllysylalanylalanylthreonylarginylacetylseryltyrosylserylisoleucylthreonylserylprolylseryl

　　glutaminylphenylalanylvalylphenylalanylleucylserylserylvalyltryptophylalanylaspartylprolylisoleucylglutamylleucylleu

　　cylasparaginylvalylcysteinylthreonylserylserylleucylglycylasparaginylglutaminylphenylalanylglutaminylthreonylglutami

　　nylglutaminylalanylarginylthreonylthreonylglutaminylvalylglutaminylglutaminylphenylalanylserylglutaminylvalyltrypto

　　phyllysylprolylphenylalanylprolylglutaminylserylthreonylvalylarginylphenylalanylprolylglycylaspartylvalyltyros

　　yllysylvalyltyrosylarginyltyrosylasparaginylalanylvalylleucylaspartylprolylleucylisoleucylthreonylalanylleucy

　　lleucylglycylthreonylphenylalanylaspartylthreonylarginylasparaginylarginylisoleucylisoleucylglutamylvalylglutam

　　ylasparaginylglutaminylglutaminylserylprolylthreonylthreonylalanylglutamylthreonylleucylaspartylalanylthreony

　　larginylarginylvalylaspartylaspartylalanylthreonylvalylalanylisoleucylarginylserylalanylasparaginylisoleucylasparag

　　inylleucylvalylasparaginylglutamylleucylvalylarginylglycylthreonylglycylleucyltyrosylasparaginylglutaminyl……