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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 longest word in any of the major English language dictionaries is pneumonoultramicroscopicsilicovolcanoconiosis, ...

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

Aug 30, 2016 ... Dictionaries omit the name of this protein and many other long words. Obviously, dictionaries have space constraints, and the average person ...

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

The longest words in Oxford Dictionaries are: antidisestablishmentarianism - opposition to the disestablishment of the Church of England - 28 letters ...

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 ...

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

Dec 12, 2012 ... 'Longest' word has 189,819 letters, takes three hours to pronounce ... in making them. The longest word in the Oxford English Dictionary is ...

www.merriam-webster.com/video/longest-word-in-the-dictionary

Longest Word in the Dictionary. It's probably not what you think it is, and here's the short, sweet reason why. play video-the-longeset-word-in-the-dictionary.

.ask.com/youtube?q=What+Is+the+Longest+Word+in+the+Dictionary%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.

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

At 45 letters, this is the longest word you'll find in a major dictionary. An inflated version of silicosis, this is the full scientific name for a disease that causes ...

www.quora.com/What-is-the-longest-word-in-the-dictionary

“Pneumonoultramicroscopicsilicovolcanoconiosis”. ( 45 letters). The longest word in any of the major English language dictionaries is ...