大部分情况下公认最长的单词是：
共1913个字母的“色氨酸合成酶A蛋白质”（一种含有267种氨基酸酶）的全称：
MethionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalylprolyphenylalanYlvalythreonylleucylglycylaspartylprolylglycylisoleucylglutamylglutaminylsErylleucyllysylisoleucylaspartylthreonylleucylIsoleucylglutamylalanylglycylalanylasparthlalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylseRylaspartylprolylleucylalanylaspartylglycylpRolylthreOnylisoleucylglutaminylasPfraginylalanylthreonylleucylarfinylalanylphenylalanylalanylalanylglycylvalythreonylprolylalanylglutaminylcysteinylphenylalanylglutamylmethionylleucylalanylleuOylisoleucylarginylglutaminyllysyhistidylprolylthreonylisoleucylprolylisoleucylglycylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalanylasparaginyllysyglycylisoleucylaspartylglutamylphenylalanylthrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylaspartylserylvalylleucylvalylalnylaspartylvalylprolylvalylglUtaminylglutamylserylalanylprolylphenylalanylarginylglutaminylalanylalanylleucylarginylhistidylasparaginyvalylalanylprolylisoleucylprolylisoleucylphenylalanylisoleucylphenylalanylisoleucylcysteinylprolylprolylaspartylalanylaspartylaspartylaspartylleucylleucylarginylglutaminylisoleucylalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrOsylleucylleucylserylarginylalanylglycylvalylthreonylglycylalanylglutamYlasparainylarginylalanylalanylleucylprolylleucylasparaginylhistidylleucylValylalanyllysylleucyllysylglutamyltyrosylasparaginylalanylalanylprolylprolylleucylglutaminylglgycylphenylalanylglycylisoleucylserylalanylprolylaspartylglutaminylvalyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanylglycylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoIeucylisoleucylglutamylglutaminylHistidylasparaginyliSoleucylglutamylprolylglutamyllysylmethionylleucylalanylalanylleucyllysylvalylphenylalanylcalylglutaminylprolylmethionlysylalanylalanylthreonylarginylserine（1934个字母）
目前最长正式英语单词是:pneumonoultramicroscopicsilicovolcanoconiosis，[医]肺尘病,矽肺病（共有45个英文字母）。
词根：
pneumono- (of lung?肺的)
ultra- (beyond 越过)
micro (very small 极小的)
scopic- (of viewing or observing 观察或注意的)
silico- (of silicon?硅的)
volcano- (mountain that releases fire and ash?火山的)
coni- ( koni, of dust?尘土的)
osis-(forming the name of a disease 表示疾病)
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
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本文概览：大部分情况下公认最长的单词是：共1913个字母的“色氨酸合成酶A蛋白质”（一种含有267种氨基酸酶）的全称：Methionylglutaminylarginyltyrosylg...
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