1 Pneumonoultramicroscopicsilicovolcanoconiosis (forty-five letters): A lung disease caused by the inhalation of silica or quartz dust.
The longest word in the world is the English term: "methionylthreonylthreonyl(...) isoleucine". This term, which has no less than 189, 819 letters, is the chemical name of the largest protein: titin. It would take three hours to recite it from beginning to end!
A word of warning… the “word” takes about 3.5 hours to say. The word is 189,819 letters long. It's actually the name of a giant protein called Titin.
The longest word in any of the major English language dictionaries is pneumonoultramicroscopicsilicovolcanoconiosis, a word that refers to a lung disease contracted from the inhalation of very fine silica particles, specifically from a volcano; medically, it is the same as silicosis.
1. methionylthreonylthreonylglutaminylalanyl… isoleucine. You'll notice there's an ellipsis here, and that's because this word, in total, is 189,819 letters long, and it's the chemical name for the largest known protein, titin.
Aequeosalinocalcalinoceraceoaluminosocupreovitriolic. This is the longest word in English which is composed of seven words. This 52-letter word was coined by Dr. Edward Strother to describe the spa waters in Bath, England.
Place with the Longest Single Word in the World
The place with the longest single word is Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu. At 85 letters, this Māori name for a hill in New Zealand is often truncated to Taumata.
The word "floccinaucinihilipilification" means "the estimation of something as worthless." It's an 18th-century coinage that combines four Latin prefixes meaning "nothing."
The longest word in the English language, pneumonoultramicroscopicsilicovolcanoconiosis, won primary school speller Jemimah Elise Sampson, the East Coast Radio's Last Kid Standing title, as seen in the video below published by the East Coast Radio.
The longest word in the standard German dictionary is Kraftfahrzeug-Haftpflichtversicherung – which is the word for motor vehicle liability insurance. But at 36 letters, it's rather puny. Rechtsschutzversicherungsgesellschaften, a touch longer at 39 letters, is the language's longest non-dictionary word.
As we saw at the start of our hunt, the longest word according to a lot of sources is the technical name for the protein titin. It is the same across all languages and has nearly 200,000 letters.
Antidisestablishmentarianism, at 28 letters, is the longest non-coined, non-systematic English word in Oxford Dictionaries. It refers to a 19th-century political movement that opposed the disestablishment of the Church of England as the state church of England.
2. PNEUMONOULTRAMICROSCOPICSILICOVOLCANOCONIOSIS. This word is the longest accepted binomial construction at 42 letters.
In that case, what's the longest word in the English language dictionary? It's pneumonoultramicroscopicsilicovolcanoconiosis.
Found in the Oxford English Dictionary, it's the name of a lung disease. Many people don't count it either, though, since it was created to win a puzzle contest in 1935. The longest word that most people can agree upon as being a “real” word is the 28-letter antidisestablishmentarianism.
The long form of the name is the longest place name in the United Kingdom and one of the longest in the world at 58 characters (51 "letters" since "ch" and "ll" are digraphs, and are treated as single letters in the Welsh language).
When the little girl was born on September 12, 1984, her parents wrote Rhoshandiatellyneshiaunneveshenk Koyaanisquatsiuth Williams on her birth certificate. However three weeks later they decided it simply wasn't long enough, so they filed an amendment which made it 1,019 letters long.
We dare you to try to pronounce it.
In fact, they often shorten it themselves. Ready? It's Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu.
One three-letter word does much of the heavy lifting in the English language. The little word "run" — in its verb form alone — has 645 distinct meanings.
According to the English for Students website, j, q, and z occur the least if you analyze the frequency of each letter in the entries of the 11th Concise Oxford Dictionary.