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Pneumonoultramicroscopicsilicovolcanoconiosis, referring to a lung disease caused by silica dust, is the longest word in official English language dictionaries with 45 letters.
The designation of this word as the longest is controversial, because it was likely coined just to be the longest word.

en.wikipedia.org/wiki/Longest_word_in_English

The identity of the longest word in English depends upon the definition of what constitutes a word in the English language, as well as how length should be ...

www.grammarly.com/blog/14-of-the-longest-words-in-english

Aug 30, 2016 ... No, you will not find the very longest word in English in this article. ... It is also one of the longest monosyllabic words of the English language.

en.oxforddictionaries.com/explore/what-is-the-longest-english-word

The longest words in Oxford Dictionaries are: ... use: they're generally just provided as answers to questions about the longest words in the English language.

www.digitalspy.com/fun/news/a444700/longest-word-has-189819-letters-takes-three-hours-to-pronounce

Dec 12, 2012 ... A man has been recorded spending more than three hours to pronounce what is supposedly the longest word in the English language.

www.npr.org/sections/krulwich/2011/01/21/133052745/whats-the-longest-word-in-the-english-language

Jan 21, 2011 ... The longest word? Well, that depends on what we mean by "word." If a word is coined just to be long, like supercalifragilisticexpialidocious, ...

.ask.com/youtube?q=What+Is+the+Biggest+Word+in+the+English+Language%3F&v=545317QVi_E
Dec 10, 2014 ... Our video explores the longest words in Oxford English Dictionary and OxfordDictionaries.com, as well as the longest place name in Britain.
.ask.com/youtube?q=What+Is+the+Biggest+Word+in+the+English+Language%3F&v=UkW1VUjN4fg
Jun 12, 2011 ... What is the longest word in the english Language? Well here is a pretty freakin long one...You will be SHOCKED AND AMAZED!!!! The word ...

mentalfloss.com/article/50611/12-exceptionally-long-or-extremely-special-words

The Longest Words in English (by Category) ... longest non-medical, non-coined, nontechnical word in the English language, yet it keeps some robust company.

www.dictionary.com/browse/pneumonoultramicroscopicsilicovolcanoconiosis

an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language. Origin of ...