Chances are you’ve had discussions or even arguments about the longest words in English. The debate ends here. The longest word in the English language is pneumonoultramicroscopicsilicovolcanoconiosis. But what does it mean? And what are the other longest words in English?
Related:
What is the Longest Word in the English Dictionary?
Pneumonoultramicroscopicsilicovolcanoconiosis is the longest word in English dictionaries like Merriam-Webster and Oxford English Dictionary. Haven’t you heard of it? Well, it’s because it’s a medical term that isn’t tossed into your everyday conversations unless you are a pulmonologist.
This 46-letter medical term is a lung condition that comes from inhalation of silica or quartz dust. So, how do you pronounce it? You can use a phonetic: new-mono-ultra-micro-scopic-silly-co-volcano-cone-i-oh-sis. Alternatively, you can call it “silicosis.”
Now, some people argue that the throne for the longest word belongs to the Methionylthreonylthreonylglutaminylarginyl…isoleucine, a protein titin. Compared to pneumonoultramicroscopicsilicovolcanoconiosis, which has 46 letters, this protein titin has 189,819 letters. It’s so long that you would need 3 hours to pronounce it (that is if you can say it correctly in one take!)
Since it’s such an unwieldy technical term, the word doesn’t really appear outside of medical texts, and the general consensus among linguists is that such a technical term shouldn’t be counted.
List of Longest Words in English
Are you curious as to what are the other words in English that will challenge your pronunciation and spelling skills? Here are more:
1. Pneumonoultramicroscopicsilicovolcanoconiosis
Number of letters: 46
Let’s go over the longest word in English again: pneumonoultramicroscopicsilicovolcanoconiosis. It’s a medical term that is 46 letters long and is about a lung disease that comes from scarring and stiffening of lung tissue after long-term exposure to silica or quartz dust.
2. Hippopotomonstrosesquippedaliophobia
Number of letters: 36
If you tense up or feel anxious whenever you come across long words, then you might have hippopotomonstrosesquippedaliophobia, which basically means that you have a fear of long words (a bit ironic, if you ask us!). Even its alternative term, sesquipedalophobia, is long.
Psychologists, however, do not recognize this runner-up for the longest word in English as an actual phobia but instead a social phobia.
3. Supercalifragilisticexpialidocious
Number of letters: 34
Growing up, many of us believed that supercalifragilisticexpialidocious is the longest word that you can find in the dictionary. But as you already know by now, it is not. Supercalifragilisticexpialidocious is only 34 letters long, taking the third spot in this list.
And here’s a more surprising twist: It doesn’t have an official meaning!
Supercalifragilisticexpialidocious comes from the song of the same name in the film Mary Poppins. According to the song, it’s a word you can use when you don’t have anything else to say!
Another fun fact is that this word doesn’t come from the Mary Poppins books, so remember to give credit to the Sherman brothers, who wrote songs for Disney, not the author P.L. Travers!
4. Eellogofusciouhipoppokunurious
Number of letters: 30
Eellogofusciouhipoppokunurious may not be as long as the longest word in the English dictionary, but its meaning is more straightforward: it means “very good” or “very fine.”
This word first appeared in print in a 1930s dictionary of American slang, and experts aren’t sure whether it originated in Nebraska or Massachusetts.
5. Floccinaucinihilipilification
Number of letters: 29
Taking the fifth spot with 29 letters is the word floccinaucinihilipilification, which is still a mouthful to say. So, what does it mean? It means judging something to be worthless or valueless. It’s a combination of multiple Latin words: floccī, naucī, nihilī, and pilī (they all mean little value, by the way) and the -fication at the end for the action. Put them together, and you get a big word for saying something (or someone) that is of little value to you!
6. Antidisestablishmentarianism
Number of letters: 28
The meaning of antidisestablishmentarianism is easy to understand if you dissect it: anti-disestablishment-arianism, which means you oppose the disestablishment.
Here’s the caveat: you do not oppose just any disestablishment, but the disestablishment of the Church of England, to be more precise.
7. Honorificabilitudinitatibus
Number of letters: 27
This 27-letter long word also comes from Latin. Looks familiar? You’ve probably read Shakespeare’s Love’s Labours Lost and wondered what the word meant. Well, this long Latin word means meaning honorableness or the state of being honored. Like many long words, it’s a tongue twister to pronounce!
8. Thyroparathyroidectomized
Number of letters: 25
Another long medical word is thyroparathyroidectomized, which means removal of thyroid and parathyroid glands. Thyroparathyroidectomy is an invasive surgery, but it can be necessary to treat a number of hormonal conditions.
9. Pseudohypoparathyroidism
Number of letters: 24
Pseudohypoparathyroidism is a rare genetic disorder that often affects bone growth and soft tissue development. It arises from insensitivity to parathyroid hormone and often runs in families.
10. Dichlorodifluoromethane
Number of letters: 23
Dichlorodifluoromethane is a colorless, non-flammable gas. It can be used as a propellant for aerosol sprays and as part of refrigeration systems.
11. Otorhinolaryngological
Number of letters: 22
This word means or relates to the medical field of treating the ears, nose, and throat. If you visit your ENT at her doctor’s office with a hoarse throat, you’re relying on her otorhinolaryngological expertise.
12. Incomprehensibilities
Number of letters: 21
At 21 letters long, the word “incomprehensibilities” is one of the easier terms to add to your vocabulary! Plus, its meaning is pretty straightforward: it’s about things that are impossible or very difficult to understand (like some of the words on these lists!)
13. Xenotransplantation
Number of letters: 19
Let’s say you need an organ transplant, but there are no available donors, and your doctor suggests an animal organ (like a pig’s skin). If you consent to the proposed alternative, you’ll undergo xenotransplantation.
14. Sesquipedalianism
Number of letters: 17
Sesquipedalianism shares a common root with word number two on our list! It means a tendency to use very long words. This list may be a favorite of yours if you tend to sesquipedalianism!
15. Trichotillomania
Number of letters: 16
Trichotillomania is compulsive hair pulling, a condition related to Obsessive Compulsive Disorder (OCD) and other psychological conditions.
Whenever a person with trichotillomania feels anxious or tense, they tend to pull out a hair for relief. This can affect the hair on the head or elsewhere – even eyelashes – and can be treated with counseling, medication, and harm reduction practices.
16. Uncopyrightable
Number of letters: 15
You’ve probably heard of the word “copyright,” but what about uncopyrightable? Don’t worry, though. This term, which first appeared in 1926, means art or intellectual property that can’t be protected by copyright. This may be because it’s hard to establish who created the intellectual property or because something is determined to belong to the general public!
17. Tergiversation
Number of letters: 14
This word’s primary meaning is equivocation or evasion of a clear statement. As you might guess, long words can be useful for tergiversation!
What’s the Longest One-Syllable Word in English?
The longest one-syllable words in English are scraunched and the archaic word strengthed, according to The Guinness Book of World Records.
Scraunched means crunched, usually referring to the sound rather than the physical state. Strengthed is an archaic form of the word strengthened. Both words take ten letters to spell, even though they’re just one syllable!
Other long monosyllabic words in English are:
| Word | Meaning | Number of letters |
| Scratched | Cut or damaged with something sharp or rough | 9 |
| Screeched | Gave a loud, sharp and piercing cry | 9 |
| Scrounged | Borrowed, foraged, or stolen | 9 |
| Squelched | Suppressed (figurative) or moved with a splashing or sucking sound as through mud or slush | 9 |
| Straights | Plural of straight, which can mean without curves or bends or candid and frank | 9 |
| Strengths | Strong attributes or assets | 9 |
| Quenched | Put out or extinguished | 8 |
What Is the Longest English Word Without Vowels?
The longest English word without vowels is nymphly, an obscure variant of nymphlike. That’s if you don’t count plurals! If you do think plurals count, there are two other words that tie with nymphly: glycyls and rhythms.
All three words have seven letters. Nymphly means resembling a nymph; glycyls are a specific kind of amino acids, and rhythms are patterns of strong and weak emphasis in music and speech, establishing a beat.
Other long English words without vowels are:
| Word | Meaning | Number of letters |
| Crypt | A chamber under a building, especially a church or cathedral | 5 |
| Crwth | A Welsh word for an an ancient Celtic stringed instrument like a violin. | 5 |
| Dryly | Being free from water or moisture | 5 |
| Glyph | A symbol that conveys information without using words | 5 |
| Myrrh | A pungent, aromatic tree resin prized for its scent | 5 |
| Hymn | A song of praise to God or intended for use in a religious service | 4 |
What’s the Longest Palindrome Word?
The longest palindrome word is tattarrattat, a 12-letter onomatopoeia coined by the author James Joyce to describe the sound of someone knocking on a door. He used it in his 1922 novel Ulysses, a stylistic choice that is typical of his emphasis on directly and closely portraying how we perceive the world and what we feel.
What Is the Longest Place Name in the World?
The longest place name in the world is Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu.
That’s the name of a hill outside a small town in New Zealand. At 85 letters, the name describes the story of a legendary local warrior who played the flute for his sweetheart on this hill.
Other longest place names in the world:
| Word | Location | Number of letters |
| Llanfairpwllgwyngyllgogerychwyrndrobwlllantysiliogogogoch | Wales | 57 |
| Onafhankelijkheidsplein | Suriname | 23 |
| Tweebuffelsmeteenskootmorsdoodgeskietfontein | South Africa | 44 |
| Chargoggagoggmanchauggagoggchaubunagungamaugg | Massachussets, United States | 45 |
| Nunathloogagamiutbingoi | Alaska | 23 |
| Azpilicuetagaraycosaroyarenberecolarrea | Basque Country, Spain | 39 |
| Mooselookmeguntic | Maine, United States | 17 |
