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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 .... Guinness World Records formerly contained a category for longest personal name used. From about 1975 to 1985, the recordholder was Adolph ...

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.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. That one ... This earns the word a Guinness World Record. It is also one of ...

www.washingtonpost.com/news/wonk/wp/2012/12/13/how-to-pronounce-the-longest-word-in-the-world

Dec 13, 2012 ... Here's a man reading aloud the longest word in the English language. It has 189,819 letters (we can't verify that) and takes more than three ...

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

In terms of sheer size, however, the longest word to be found in Britain is the Welsh place name ... English word? Or you may be interested in: What is the longest English word containing no letter more than once? ... Most popular in the world.

.ask.com/youtube?q=What+Is+the+Longest+Word+in+the+World%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 ...
.ask.com/youtube?q=What+Is+the+Longest+Word+in+the+World%3F&v=bU68ybBRq1w
Jan 4, 2011 ... Tom says the longest word in the world which is a place name in New Zealand. Cool.

gizmodo.com/5962401/the-longest-word-in-english-takes-35-hours-to-pronounce

Nov 21, 2012 ... The longest word in English has 189819 letters and would take you three and a half hours to pronounce correctly. Seriously. It's the chemical ...

geekologie.com/2012/11/worlds-longest-word-has-189819-letters-t.php

Nov 20, 2012 ... This is a video of some guy pronouncing the longest word in the world, which is the chemical name for titan (aka connectin), a human protein, ...