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Learn EnglishFrom what I managed to find out, the longest word in English has 189,819 letters and it is chemical name of titin, the largest known protein. I know this is a bit silly but this is what some online sources claim.
Here are some other long English words:
(45 letters), it is a lung disease caused by the inhalation of quartz dust or silica
(34 letters) the ward appeared in the Mary Poppins film, you are supposed to use it “when you have nothing to say” 😀
(27 letters) this is the longest word in Shakespeare's works; longest word in the English language featuring alternating consonants and vowels
(21 letters) the word was record in the 1990s as the longest word “in common usage.”