Have you ever wondered about the longest word in English? Sounds new to you? There are a few long words in English that you can learn to improve your vocabulary. It can be a little tricky to remember long words, but we have also provided a trick to learn them. Long words are coined from smaller root words joined together. If you break them down and understand the meaning of each of them, it will be easy for you to remember the entire word. The longest words in English have been provided below, along with their meanings for your reference.

What Is the Longest Word in the English Language?
How to Pronounce Pneumonoultramicroscopicsilicovolcanoconiosis?
Frequently Asked Questions on the Longest Word in English

What Is the Longest Word in the English Language?

The longest word in English is “pneumonoultramicroscopicsilicovolcanoconiosis.” It’s the longest word in the English dictionary, but it’s technically not a real word.

Pneumonoultramicroscopicsilicovolcanoconiosis is a combination of several Latin terms and a synonym for an inflammatory lung disease called silicosis. Other words for silicosis are “pneumoconiosis” and “black lung.” Now, let’s check out the longest words provided below:

1. Methionylthreonylthreonylglutaminylarginyl…

189,819 letters

It is the chemical composition of titin, the name of the largest known protein to mankind to date. It will take you somewhere from two to three and a half hours to even pronounce it in full. You won’t even find this word in any dictionary because there is still some argument about whether this should even be considered a word.

2. Pneumonoultramicroscopicsilicovolcanoconiosis

45 letters

Referred to as the longest word in many English dictionaries, it is a type of lung disease. It is caused by inhaling very fine silicate or quartz dust. You will come across this word in language challenges because of its length. Even though it is a mouthful, it is also a great example of how specific medical terms can be.

3. Hippopotomonstrosesquippedaliophobia

36 letters

It means the fear of long words. It's funny how this long word captures the very fear it describes. It is a great example of how playful and funny the English language can be at the same time. Can you think of someone trying to say this to describe their fear of words? There is no guarantee that they will not stumble over the pronunciation. If you cannot remember any other long English words, just try to remember this one.

4. Supercalifragilisticexpialidocious

34 letters

This whimsical word was made famous by the film Mary Poppins. It means something wonderful, fantastic, or extraordinary. You can use it in your conversations to describe a situation when you witnessed something extraordinary or something amazing happen to you, like getting an A on your English test. Moreover, it is a funny word to say. Try practicing it a few times out loud.

5. Antidisestablishmentarianism

28 letters

This word describes a political position that started in 19th-century Britain. It supports keeping the Church of England as the established church. While it's mostly historical, it's also a classic example of a long English word. If you're into history and politics, learning this word can help you connect with others who share the same interests.

6. Psychoneuroendocrinological

27 letters

This impressive term connects psychology, the nervous system, and hormones. It describes the scientific study of how our thoughts and emotions can influence hormonal changes in our bodies. You might come across this word if you are researching mental health. It highlights the complicated relationship between our minds and physical well-being.

7. Sesquipedalianism

17 letters

The fourteenth word on our list describes the tendency to use long words, sesquipedalianism. If you possess this trait, you will enjoy trying to use the words in this article in your next conversation. If you are a true sesquipedalian, it shouldn’t be too hard. Except, of course, for that 189,819-letter protein name . . . it’s doubtful that your friends will wait three hours for you to finish saying it!

8. Spectrophotofluorometrically

28 letters

This is a 28-letter word that is also counted as one of the longest words in English. This is used as an adverb that describes the measurement of light given off with an instrument called a spectrophotofluorometer.

9. Pneumoencephalographically

26 letters

This 26-letter technical term refers to the antiquated medical practices where spinal fluid is evacuated and the air is introduced to provide for a clearer view of the brain’s structural components.

10. Otorhinolaryngological

22 letters

This 22-letter word is another long word in English, used as an adjective for something pertaining to otorhinolaryngology. It is the study of anything related to or the conditions dealing with the ear, nose, and throat.

How to Pronounce Pneumonoultramicroscopicsilicovolcanoconiosis

To pronounce Pneumonoultramicroscopicsilicovolcanoconiosis, let’s split it up and see phonetic spelling: nyoo-muh-noh-uhl-truh-mahy-kruh-skop-ik-sil-i-koh-vol-key-noh-koh-nee-oh-sis.

Also, let us try and write it phonetically: / ˈnu mə noʊˌʌl trəˌmaɪ krəˌskɒp ɪkˈsɪl ɪˌkoʊ vɒlˌkeɪ noʊˌkoʊ niˈoʊ sɪs, ˈnyu- /

Frequently Asked Questions on the Longest Word in English

Q1. What is the 1900000-letter word?

Answer: “Methionylthreonylthreonylglutaminylarginyl… isoleucine”. That's the scientific name for the largest protein in the human body, scientifically known as 'titin,' made up of over 190,000 letters. Yep, you heard that right!

Q2. What is the full word for methionylthreonylthreonylglutaminylarginyl isoleucine?

Answer: Methionylthreonylthreonylglutaminylarginyl...isoleucine' is the chemical name of 'titin' (also known as 'connectin’) - the largest known protein. It has 189,819 letters. However, in the past it has been disputed whether or not it is a real word - proteins are named after the chemicals involved in making them.

Q3. Is pneumonoultramicroscopicsilicovolcanoconiosis a real word?

Answer: Pneumonoultramicroscopicsilicovolcanoconiosis is famous for being one of the world's longest words, although factitious. The word means "a lung disease caused by inhalation of very fine silica dust usually found in volcanoes".

Q4. Is eellogofusciouhipoppokunurious a real word?

Answer: “Eellogofusciouhipoppokunurious” is a 30-letter adjective that means “very good or fine.” It's one of the longest words in English. For example, “The chef's special dessert was nothing short of eellogofusciouhipoppokunurious, a truly delightful treat!”

Q5. Is "supercalifragilisticexpialidocious" a real word?

Answer: Supercalifragilisticexpialidocious is used to describe something that is extremely good, super, amazing, or excellent. It is a real word and is listed in most dictionaries. It was made famous in the 1964 Disney movie Mary Poppins, which features a song that uses the word supercalifragilisticexpialidocious.

Q6. Is hexakosioihexekontahexaphobia a real word?

Answer: Hexakosioihexekontahexaphobia. That's a real word. And it means something very simple: the age-old superstitious fear of the number 666. “Those who would not worship the image of the beast (would) be slain,” warned St.