Longest Word in Common English Dictionaries

Some longest word in English depends on the definition of how the word come about in the English language and as well as how length should be compared. 

Here is a short list of longer words below (excluding chemical compounds, which can run up to 189,819 letters)

1. AEQUEOSALONOCALCALINOCERACEOALINOSOCUPREOVITRIOLIC: noun,  a word coined by Dr. Edward Strother to describe the spa waters in Bath, England.
At 52 letters, this is the longest English word ever created that appears outside literature. Many scholars in the 17th Century (Dr. Strother’s time) spoke Latin fluently. Therefore, much of the word stems from the dead romance language. Let’s break it down.
“Aequo” means equal in Latin. 
“Salino” comes from “salinus,” the Latin word for “containing salt.”
“Calcalino,” “aluminoso,” and “cupreo” are all derivative words of their corresponding minerals: calcium, aluminum, and copper, respectively. Waters at the bathhouse must have contained all three.
“Cera” (embedded within “caraceo”) means “wax” in Latin.
Finally, “vitriolic” functions as an adjective, meaning “resembling vitriol.” And vitriol is a sulfate of any of various metals (as copper, iron, or zinc).
These waters were a solution of equal parts salt, calcium, aluminum, copper, and other metallic sulfates that felt sort of waxy.

2. ANTIDISESTABLISHMENTARIANISM: everyone’s favorite agglutinative, entered the pop-culture lexicon on August 17, 1955, when Gloria Lockerman, a 12-year-old girl from Baltimore, correctly spelled it on The $64,000 Question as millions of people watched from their living rooms. At 28 letters, the word, which defines a 19th-century British political movement that opposes proposals for the disestablishment of the Church of England, is still regarded as the longest non-medical, non-coined, nontechnical word in the English language.

3. HIPPOPOTOMONSTROAESQUIPPEDALIOPHOBIA: noun, fear of long words.
This word has four basic components changed to fit together phonologically: hippopotamus, monstrous, sesquipedalian, and phobia.
Many theorize “hippopoto” was added as an etymological joke to make the word a little longer — and thereby making people who suffer from the syndrome even more terrified. “Sesquipedalian” is an adjective that means having many syllables.
String all these together, at 36 letters, and hippopotomonstrosesquippedaliophobia means fear of monstrously multisyllabic words.

4. SUPERCALIFRAGILISTICEXPIALIDOCIOUS: adjective, extraordinarily good; wonderful.
Made famous by the song of the same title in the children’s movie “Mary Poppins,” this word somehow ended up in the Oxford Dictionary.
Robert and Richard Sherman co-wrote the song for a duet with Julie Andrews and Dick Van Dyke, famous songbirds of the ’60s. It’s no wonder the 34-letter word stuck.

5.  METHIONYLTHREONYLTHREONYGLUTAMINYLARGINYL…ISOLEUCINE 
Note the ellipses. All told, the full chemical name for the human protein titin is 189,819 letters, and takes about three-and-a-half hours to pronounce. The problem with including chemical names is that there’s essentially no limit to how long they can be. For example, naming a single strand of DNA, with its millions and millions of repeating base pairs, could eventually tab out at well over a billion letters.

6. PNEUMONOULTRAMICROSCOPICSILICOVOLCANOCONIOSIS
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 inflammation in the lungs owing to the inhalation of very fine silica dust. Despite its inclusion in the dictionary, it’s generally considered superfluous, having been coined simply to claim the title of the longest English word.

7. PARASTRATIOSPHECOMYIA STRATIOSPHECOMYIOIDES 
The longest accepted binomial construction, at 42 letters, is a species of soldier fly native to Thailand. With a lifespan of five to eight days, it’s unlikely one has ever survived long enough to hear it pronounced correctly.

8. PSEUDOPSEUDOHYPOPARATHYROIDISM
This 30-letter thyroid disorder is the longest non-coined word to appear in a major dictionary.

9. FLOCCINAUCINIHILIPILIFICATION
By virtue of having one more letter than antidisestablishmentarianism, this is the longest non-technical English word. A mash up of five Latin roots, it refers to the act of describing something as having little or no value. While it made the cut in the Oxford English Dictionary, Merriam-Webster volumes refuse to recognize it, chalking up its existence to little more than linguistic ephemera.

10. SUBDERMATOGLYPHIC
At 17 characters, this is the longest accepted isogram, a word in which every letter is used only once, and refers to the underlying dermal matrix that determines the pattern formed by the whorls, arches, and ridges of our fingerprints. 

11. SQUIRRELLED
Though the more commonly accepted American English version carries only one L, both Oxford and Merriam-Webster dictionaries recognize this alternate spelling and condone its one syllable pronunciation (think “world”), making it the longest non-coined monosyllabic English word at 11 letters.

12. ABSTENTIOUS
One who doesn’t indulge in excesses, especially food and drink; at 11 letters this is the longest word to use all five vowels in order exactly once.

13. ROTAVATOR 
A type of soil tiller, the longest non-coined palindromic word included in an English dictionary tallies nine letters. Detartrated, 11 letters, appears in some chemical glossaries, but is generally considered too arcane to qualify.

14. CWTCH
The longest words to appear in a major dictionary comprised entirely of either vowels or consonants. A Cwtch, or crwth, is from the Welsh word for a hiding place.

15. EUOUAE
a medieval musical term, is technically a mnemonic, but has been accepted as a word in itself.