英語學習中英語單詞也許就是最大的障礙，枯燥無味，不停地背、寫、聽，可能一轉眼就又忘了。要是在碰到由十幾個字母組成的就讓人頭禿。然而世界上有的專用名詞更長，今天就來帶你見識下世界上吉尼斯紀錄最長的英文單詞，看看你得花多久記憶！

網傳由189819個字母組成

網傳，世界上吉尼斯紀錄最長的單詞是一種含有267種氨基酸的酶的化學學名：色氨酸合成酶a蛋白質，一共含有189819個字母。估計讀完整個單詞，需要花費大概3.5個小時。

methionylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanyl-

glutaminylleucyllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalyl-prolyphenylalanylvalythreonylleucylglycylaspartylprolylglycylisoleucyl-glutamylglutaminylserylleucyllysylisoleucylaspartylthreonylleucylisoleucyl-glutamylalanylglycylalanylasparthlalanylleucylglutamylleucylglycylisoleucylprolyl-phenylalanylserylaspartylprolylleucylalanylaspartylglycylprolylthreonylisoleucyl-glutaminylaspfraginylalanylthreonylleucylarfinylalanylphenylalanylalanylalanyl-glycylvalythreonylprolylalanylglutaminylcysteinylphenylalanylglutamylmethionylleu-cylalanylleuoylisoleucylarginylglutaminyllysyhistidylprolylthreonylisoleucylprolyli-soleucylglycylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalany-lasparaginyllysyglycylisoleucylaspartylglutamylphenylalanylthrosylalanyl-glutaminylcysteinylglutamyllysylvalylglycylvalylaspartylserylvalylleucylval-ylalnylaspartylvalylprolylvalylglutaminylglutamylserylalanylprolylphenylalanylarginyl-glutaminylalanylalanylleucylarginylhistidylasparaginyvalylalanylprolylisoleucyl-prolylisoleucylphenylalanylisoleucylphenylalanylisoleucylcysteinylprolylproly-laspartylalanylaspartylaspartylaspartylleucylleucylarginylglutaminylisoleucy-lalanylseryltyrosylglycylarginylglycyltyrosylthreonyltyrosylleucylleucylsery-larginylalanylglycylvalylthreonylglycylalanylglutamylasparainylarginylalanylalanylleucyl-prolylleucylasparaginylhistidylleucylvalylalanyllysylleucyllysylglutamyltyrosylasparaginy-lalanylalanylprolylprolylleucylglutaminylglgycylphenylalanylglycylisoleucylserylalanylproly-laspartylglutaminylvalyllysylalanylalanylisoleucylaspartylalanylglycylalanylalanylgly-cylalanylisoleucylserylglycylserylalanylisoleucylvalyllysylisoieucylisoleucylglutamyl-glutaminylhistidylasparaginylisoleucylglutamylprolylglutamyllysylmethionylleucylalany-lalanylleucyllysylvalylphenylalanylcalylglutaminylprolylmethionlysylalanylalanylthreony-larginylserine

但以上這個所謂的這個1913個字母的英語單詞，隻是拚接而成的。這個單詞僅僅隻是在形式上按照順序把蛋白中所含的所有氨基酸殘基的英文名字排列在了一起。其真正的英文名稱實際上隻有5個字母：Titin。

世界公認的為45個字母

這下就有人開始疑惑了，世界上吉尼斯紀錄最長的英語單詞到底是哪一個單詞呢？答案揭秘pneumonoultramicroscopicsilicovolcanoconiosis其讀音[?nju:m?n?u??ltr??maikr?s?k?pik?silik?v?l?kein?ko?n?'o?sis]這個單詞的意思為“肺塵病”或“矽肺病”。

事實上關於世界上吉尼斯紀錄最長的英語單詞都有不同的說法，因為很多單詞經過變化以後都會變長等，在不同的領域所認為的最長單詞也不相一致。所以我們也通常稱之為“世界上最長的單詞之一”。 

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