依我以希
世界上最长的英文单词是pneumonoultramicroscopicsilicovolcanoconiosis
它的发音音标['nju:mənəʊ ˌʌltrə-ˌmaɪkrəs' kɒpɪk'sɪlɪkəvɒl'keɪnəʊ kəʊnɪ'əʊsɪs]
这个词汇主要用于医学方面，它本身其实是拥有众多词根组成的。
这些词根包括：pneumono-、ultra-、micro、scopic- 、silico- 、coni-、osis-
扩展资料：
关于最长的英文单词有很多种说法，网络上还有很流行的19万个字母的单词，有一些的确实是被权威词典收录的，还有一些只是网友们的调侃。
这些最长的英文单词并不需要背下来，但可以了解和感受一下外语的魅力。
1、牛津词典网站上收录的最长的英文单词
antidisestablishmentarianism——反对英格兰教会政教分离，维护国教主义——28个字母
floccinaucinihilipilification——评判某物一文不值，藐视的态度——29个字母
hippopotomonstrosesquippedaliophobia——长单词恐惧症——36个字母
pneumonoultramicroscopicsilicovolcanoconiosis——一种虚构的肺部疾病，由长时间吸入矿石或金属灰尘（如硅或石英）引起，据说矿工最容易得这种病——45个字母
2、纯粹比较长度最长的英文单词
如果纯粹只看长度，其实英语中最长的单词是威尔士的一个地名：Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch。
这个单词的意思是“红岩洞附近的圣田西路教堂的湍急旋涡附近的白榛树林山谷中的圣马利亚教堂”。通常该地名简写为 Llanfair PG。
3、牛津英语词典收录的长英文单词
《牛津英语大辞典》（Oxford English Dictionary）作为一部历史性词汇的词典还收录了很多长度在20多个字母左右的单词，其中大多数都是非常技术性的词汇。
这些单词包括：
Otorhinolaryngological——22个字母
Immunoelectrophoretically——25个字母
psychophysicotherapeutics——25个字母
thyroparathyroidectomized——25个字母
pneumoencephalographically——26个字母
radioimmunoelectrophoresis——26个字母
psychoneuroendocrinological——27个字母
hepaticocholangiogastrostomy——28个字母
spectrophotofluorometrically——28个字母
pseudopseudohypoparathyroidism——30个字母
粒粒soso
最长的单词：methionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalylprolyphenylalanylvalythreonylleucylglycylaspartylprolylglycylisoleucylglutamylglutaminylserylleucyllysylisoleucylaspartylthreonylleucylisoleucylglutamylalanylglycylalanylasparthlalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylserylaspartylprolylleucylalanylaspartylglycylprolylthreonylisoleucylglutaminylaspfraginylalanylthreonylleucylarfinylalanylphenylalanylalanylalanylglycylvalythreonylprolylalanylglutaminylcysteinylphenylalanylglutamylmethionylleucylalanylleuoylisoleucylarginylglutaminyllysyhistidylprolylthreonylisoleucylprolylisoleucylglycylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalanylasparaginyllysyglycylisoleucylaspartylglutamylphenylalanylthrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylaspartylserylvalylleucylvalylalnylaspartylvalylprolylvalylglutaminylglutamylserylalanylprolylphenylalanylarginylglutaminylalanylalanylleucylarginylhistidylasparaginyvalylalanylprolylisoleucylprolylisoleucylphenylalanylisoleucylphenylalanylisoleucylcysteinylprolylprolylaspartylalanylaspartylaspartylaspartylleucylleucylarginylglutaminylisoleucylalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrosylleucylleucylserylarginylalanylglycylvalylthreonylglycylalanylglutamylasparainylarginylalanylalanylleucylprolylleucylasparaginylhistidylleucylvalylalanyllysylleucyllysylglutamyltyrosylasparaginylalanylalanylprolylprolylleucylglutaminylglgycylphenylalanylglycylisoleucylserylalanylprolylaspartylglutaminylvalyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanylglycylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoieucylisoleucylglutamylglutaminylhistidylasparaginylisoleucylglutamylprolylglutamyllysylmethionylleucylalanylalanylleucyllysylvalylphenylalanylcalylglutaminylprolylmethionlysylalanylalanylthreonylarginylserine（汉语意思：色氨酸合成酶A蛋白质）词组就不知道了
妮子125940
bababadalgharaghtakamminarronnkonnbronntonnerronntuonn-thunntrovarrhounawnskawntoohoohoordenenthurnuk 某书中的 象征亚当与夏娃的堕落
奥迪风度
MethionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalylprolyphenylalanYlvalythreonylleucylglycylaspartylprolylglycylisoleucylglutamylglutaminylsErylleucyllysylisoleucylaspartylthreonylleucylIsoleucylglutamylalanylglycylalanylasparthlalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylseRylaspartylprolylleucylalanylaspartylglycylpRolylthreOnylisoleucylglutaminylasPfraginylalanylthreonylleucylarfinylalanylphenylalanylalanylalanylglycylvalythreonylprolylalanylglutaminylcysteinylphenylalanylglutamylmethionylleucylalanylleuOylisoleucylarginylglutaminyllysyhistidylprolylthreonylisoleucylprolylisoleucylglycylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalanylasparaginyllysyglycylisoleucylaspartylglutamylphenylalanylthrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylaspartylserylvalylleucylvalylalnylaspartylvalylprolylvalylglUtaminylglutamylserylalanylprolylphenylalanylarginylglutaminylalanylalanylleucylarginylhistidylasparaginyvalylalanylprolylisoleucylprolylisoleucylphenylalanylisoleucylphenylalanylisoleucylcysteinylprolylprolylaspartylalanylaspartylaspartylaspartylleucylleucylarginylglutaminylisoleucylalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrOsylleucylleucylserylarginylalanylglycylvalylthreonylglycylalanylglutamYlasparainylarginylalanylalanylleucylprolylleucylasparaginylhistidylleucylValylalanyllysylleucyllysylglutamyltyrosylasparaginylalanylalanylprolylprolylleucylglutaminyllgycylphenylalanylglycylisoleucylserylalanylprolylaspartylglutaminylvalyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanylglycylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoIeucylisoleucylglutamylglutaminylHistidylasparaginyliSoleucylglutamylprolylglutamyllysylmethionylleucylalanylalanylleucyllysylvalylphenylalanylcalylglutaminylprolylmethionlysylalanylalanylthreonylarginylserine
菁菁super5man
单词 pneumonoultramicroscopicsilicovolcanoconiosis [医]硅酸盐沉着病,矽肺病 以上过去在电视节目中讲过。 现在又有一说，最长的单词是“色氨酸合成酶A蛋白质” MethionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalylprolyphenylalanYlvalythreonylleucylglycylaspartylprolylglycylisoleucylglutamylglutaminylsErylleucyllysylisoleucylaspartylthreonylleucylIsoleucylglutamylalanylglycylalanylasparthlalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylseRylaspartylprolylleucylalanylaspartylglycylpRolylthreOnylisoleucylglutaminylasPfraginylalanylthreonylleucylarfinylalanylphenylalanylalanylalanylglycylvalythreonylprolylalanylglutaminylcysteinylphenylalanylglutamylmethionylleucylalanylleuOylisoleucylarginylglutaminyllysyhistidylprolylthreonylisoleucylprolylisoleucylglycylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalanylasparaginyllysyglycylisoleucylaspartylglutamylphenylalanylthrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylaspartylserylvalylleucylvalylalnylaspartylvalylprolylvalylglUtaminylglutamylserylalanylprolylphenylalanylarginylglutaminylalanylalanylleucylarginylhistidylasparaginyvalylalanylprolylisoleucylprolylisoleucylphenylalanylisoleucylphenylalanylisoleucylcysteinylprolylprolylaspartylalanylaspartylaspartylaspartylleucylleucylarginylglutaminylisoleucylalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrOsylleucylleucylserylarginylalanylglycylvalylthreonylglycylalanylglutamYlasparainylarginylalanylalanylleucylprolylleucylasparaginylhistidylleucylValylalanyllysylleucyllysylglutamyltyrosylasparaginylalanylalanylprolylprolylleucylglutaminylglgycylphenylalanylglycylisoleucylserylalanylprolylaspartylglutaminylvalyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanylglycylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoIeucylisoleucylglutamylglutaminylHistidylasparaginyliSoleucylglutamylprolylglutamyllysylmethionylleucylalanylalanylleucyllysylvalylphenylalanylcalylglutaminylprolylmethionlysylalanylalanylthreonylarginylserine 本人认为该单词完全由表示氨基酸的词缀构成，表示了一个完整的氨基酸序列。如此推来，随多肽测序技术的发展，一定还会有更长的单词出现，但这样的单词不实用，一定有简称。所以本人推荐第一种说法。
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