What Is The Longest Known Word In English?

How many of us know that there are indeed words in the English language that can be more than forty four letters long?! The longest known word that can be used commonly is 'Pneumonoultramicroscopicsilicovolcanokoniosis' This word refers to a type of lung disease, which can be caused when a person breathes in small particles of volcanic dust from the atmosphere.

It is often said that this strange word was coined by its creator Everett Smith in the year 1935, simply for the purpose of coining the longest word in the English language at the time. Even today, this remains the longest word, followed closely by the word 'Hepaticocholangiocholecystenterostomies' meaning a surgical connection made artificially from the gall bladder and the hepatic duct, to the intestine. The third longest word known today is the 'Supercalifragilisticexpialidocious', a word coined as the song title for the movie 'Mary Poppins' by Walt Disney.

The longest word in any English dictionary is

PNEUMONOULTRAMICROSCOPICSILICOVOLCANOLCANOCONIOSIS

at 45 letters. This apparently refers to a disease of the lungs contracted through breathing in silica dust from volcanoes. This disease does exist, but is usually called pneumoconiosis. The other word was deliberately coined i a effort to produce the longest word in English. There are a few other words nearly as long as this, but they are all medical terms and known only to specialists.

The longest word in (relatively) general use is still

ANTIDISESTABLISHMENTARIANISM.

This word was coined in the 19th century. It means opposition to disestablishment (the separation of church and state.) A disestablishmentarianist supports this separation, whereas an antidisestablishmentarianist is against it.

The longest word in this well known dictionary (sorry I don't know the name) is FLAUCINAUCINIHILIPILIFICATION. It's composed of 29 letters and it means "nothing"... My teacher before told us that...

The longest word in the English dictionary is Pneumonoultramicroscopicsilicovolcanoconiosis ( a kind of rare lung disease) but actually it depends on how you define a word, see this page on Wikipedia Longest word in English

There are lots of theories on this as it depends what you actually mean by "english language"

The word pneumonoultramicroscopicsilicovolcanoconiosis (45 letters) is widely regarded as the longest word in the major dictionaries but pseudopseudohypoparathyroidism (30 letters) is the longest word in the Oxford English Dictionary.

Antidisesttablishmantarianism longest non- technical word

Pneumonoultramicroscopicsilicovolcanoconiois longest technical word

As you haven't defined if you're looking for a dictionary word, so
1. There's a protein normally known as titin or connectin, which is of about of 189,819 letters, so i can't write it here see the full chemical name here
It isn't included in Dictionary(Hopefully! ;-P)

2. Aristophanes' a major greek author coined a word of about 183 letters in his comedy Assemblywomen.
Word: Lopado­temakho­selakho­galeo­kranio­leipsano­drim­hypo­trimmato­silphio­karabo­melito­katakekhy­meno­kikhl­epi­kossypho­phatto­perister­alektryon­opto­kephallio­kigklo­peleio­lagōio­siraio­baphē­tragano­pterýgōn
It's also not included in the dictionary, and if you ask accourately, it's a greek transliteration.

3. There's a name of a hill in New Zealand which is officially recognised name, it has 85 letters.
Word:Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu
It's a place name, and yet not added in any major dictionary

4. As other answerers also said, a disease naming of 45 letters is said to be the longest technical word.
Word: Pneumonoultramicroscopicsilicovolcanoconiosis
It's the longest word to appear in a English Language Dictionary

5. It's the longest coined word. 29 letters
Word: Floccinaucinihilipilification
Included in Oxford Dictionary, defined as "the action or habit of estimating as worthless"

6. Now the above words were all coined or technical word or migrated from foreign language, This word is the longest english word which is nor technical neither coined, it has 28 letters
Word:Antidisestablishmentarianism

It'll help you a bit!