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Rebecca O'Connell
Rebecca O'Connell

What's the Longest Word in the World? Here are 12 of Them, By Category

Rebecca O'Connell
Rebecca O'Connell

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 is defined as 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, yet it keeps some robust company. Here are some examples of the longest words by category.

1. 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 1 billion letters.

2. LOPADOTEMACHOSELACHOGALEOKRANIOLEIPSAN …P TERYGON

The longest word ever to appear in literature comes from Aristophanes’ play, Assemblywomen, published in 391 BC. The Greek word tallies 171 letters, but translates to 183 in English. This mouthful refers to a fictional fricassee comprised of rotted dogfish head, wrasse, wood pigeon, and the roasted head of a dabchick, among other culinary morsels. 

3. 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.

4. 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.

5. PSEUDOPSEUDOHYPOPARATHYROIDISM

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

6. 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.

7. 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. 

8. 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.

9. 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.

10. 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.

11. and 12. CWTCH, EUOUAE

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

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Oxford English Dictionary // Public Domain
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History
The Time the Oxford English Dictionary Forgot a Word
Sir James Murray in his Scriptorium
Sir James Murray in his Scriptorium
Oxford English Dictionary // Public Domain

When the complete edition of what would become the Oxford English Dictionary debuted in 1928, it was lauded as a comprehensive collection of the English language, a glossary so vast—and so thorough—that no other reference book could ever exceed its detail or depth. In total, the project took seven decades to catalogue everything from A to Z, defining a total of 414,825 words. But in the eyes of its editor James Murray, the very first volume of the dictionary was something of an embarrassment: It was missing a word.

Looking back, it’s impressive that more words were not lost. Assembling the OED was a nightmare. Before the first volume—an installment consisting of words beginning with the letters A and B—was published in 1888, multiple editors had taken (and abandoned) the helm, and each regime change created new opportunities for mayhem. When James Murray took command in 1879, the Oxford English Dictionary could best be defined by the word disarray.

The irony of making this massive reference book was that it required millions upon millions of tiny, tiny pieces of paper. Every day, volunteers mailed in thousands of small strips of paper called “quotation slips.” On these slips, volunteers would copy a single sentence from a book, in hopes that this sentence could help illuminate a particular word’s meaning. (For example, the previous sentence might be a good example of the word illuminate. Volunteers would copy that sentence and mail it to Oxford’s editors, who would review it and compare the slip to others to highlight the word illuminate.)

The process helped Oxford’s editors study all of the shades of meaning expressed by a single word, but it was also tedious and messy. With thousands of slips pouring into the OED’s offices every day, things could often go wrong.

And they did.

Some papers were stuffed haphazardly into boxes or bags, where they gathered cobwebs and were forgotten. Words beginning with Pa went missing for 12 years, only to be recovered in County Cavan, Ireland, where somebody was using the papers as kindling. Slips for the letter G were nearly burned with somebody’s trash. In 1879, the entire letter H turned up in Italy. At one point, Murray opened a bag only to find a family of live mice chewing on the paperwork.

When Murray took over, he tried to right the ship. To better organize the project, he built a small building of corrugated iron called the “Scriptorium.” It resembled a sunken tool shed, but it was here—with the help of 1029 built-in pigeonholes—that Murray and his subeditors arranged, sorted, and filed more than a thousand incoming slips every day. Millions of quotations would pass through the Scriptorium, and hundreds of thousands of words would be neatly organized by Murray’s trusty team.

One word, however, slipped through the cracks.

Oxford English Dictionary entry slips
Oxford English Dictionary entry slips
Media Specialist, Flickr // CC BY-NC-SA 2.0

Bondmaid is not the kind of word people drop during conversation anymore, and that’s for the best: It means “a slave girl.” The word was most popular in the 16th century. Murray’s file for bondmaid, however, reached back even further: It included quotations as old as William Tyndale’s 1526 translation of the Bible.

But then bondmaid went missing. “Its slips had fallen down behind some books, and the editors had never noticed that it was gone,” writes Simon Winchester in The Meaning of Everything. When the first volume of the Oxford English Dictionary was published in 1888, bondmaid wasn’t there. (That volume of the OED does miss other words, but those exclusions were deliberate matters of editorial policy—bondmaid is the only word that the editors are known to have physically lost.)

When the slips were later rediscovered in the Scriptorium, Murray reportedly turned red with embarrassment. By 1901, some 14 years after the exclusion, he was still reeling over the mistake in a draft of a letter addressed to an anonymous contributor: “[N]ot one of the 30 people (at least) who saw the work at various stages between MS. and electrotyped pages noticed the omission. The phenomenon is absolutely inexplicable, and with our minute organization one would have said absolutely impossible; I hope also absolutely unparalleled.”

All was not lost for the lost word, however. In 1933, bondmaid made its Oxford dictionary debut. It had taken nearly five decades to make the correction.

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10 Fascinating Facts About The Thesaurus

Writers often turn to a thesaurus to diversify their vocabulary and add nuance to their prose. But looking up synonyms and antonyms in a thesaurus can help anyone—writer or not—find the most vivid, incisive words to communicate thoughts and ideas. Since January 18 is Thesaurus Day, we’re celebrating with these 10 fascinating facts about your thesaurus.

1. ITS NAME COMES FROM THE GREEK WORD FOR TREASURE.

Greek lettering.
iStock

Most logophiles consider the thesaurus to be a treasure trove of diction, but the word thesaurus really does mean treasure! It derives from the Greek word thésauros, which means a storehouse of precious items, or a treasure.

2. YOU CAN CALL THEM THESAURUSES OR THESAURI.

Row of old books lined up.
iStock

How do you refer to more than one octopus? People say everything from octopuses, octopi, and octopodes. Similarly, many people have trouble figuring out the correct plural form of the word thesaurus. Though thesauri is technically correct—it attaches a Latin suffix to the Latin word thēsaurus—both thesauri and thesauruses are commonly used and accepted today.

3. EARLY THESAURUSES WERE REALLY DICTIONARIES.

Close-up of the term 'ideal' in a thesaurus.
iStock

Ask a French scholar in the 16th century to see his thesaurus, and he'd gladly give you a copy of his dictionary. In the early 1530s, a French printer named Robert Estienne published Thesaurus Linguae Latinae, a comprehensive Latin dictionary listing words that appeared in Latin texts throughout an enormous span of history. And in 1572, Estienne's son Henri published Thesaurus Linguae Graecae, a dictionary of Greek words. Although the Estiennes' books were called thesauruses, they were really dictionaries comprised of alphabetical listings of words with their definitions.

4. A GREEK HISTORIAN WROTE THE FIRST BOOK OF SYNONYMS.

Stacks of books surrounding an open book and a pair of glasses.
iStock

Philo of Byblos, a Greek historian and grammarian, wrote On Synonyms, a dictionary of synonyms that scholars consider to be the first ancient thesaurus. Dating to the late 1st century or early 2nd century CE, the book lists Greek words that are similar in meaning to each another. Sadly, we don’t know much more about On Synonyms because copies of the work haven’t survived over the centuries.

5. AN EARLY SANSKRIT THESAURUS WAS IN THE FORM OF A POEM.

Sanskrit lettering.
iStock

In the 4th century CE, an Indian poet and grammarian named Amara Sinha wrote The Amarakosha, a thesaurus of Sanskrit words. Rather than compile a boring list of similar words, Amara Sinha turned his thesaurus into a long poem. Divided into three sections—words relating to the divine, the earth, and everyday life—The Amarakosha contains verses so readers could memorize words easily. This thesaurus is the oldest book of its kind that still exists.

6. A BRITISH DOCTOR WROTE THE FIRST MODERN THESAURUS.

Portrait of Peter Mark Roget.
Thomas Pettigrew, Wikimedia Commons // Public Domain

Peter Mark Roget is the British doctor credited with authoring the first modern thesaurus. In 1805, he began compiling a list of words, arranged by their meaning and grouped according to theme. After retiring from his work as a physician in 1852, Roget published his Thesaurus of English words and phrases; so classified and arranged as to facilitate the expression of ideas and assist in literary composition. Today, Roget’s Thesaurus is still commercially successful and widely used. In fact, we celebrate Thesaurus Day on January 18 because Roget was born on this day in 1779.

7. THE THESAURUS HAS A SURPRISING LINK TO A MATHEMATICAL TOOL.

Image of a vintage log log slide rule.
Joe Haupt, Flickr // CC BY-SA 2.0

The division between "words people" and "numbers people" is deep-seated. Many mathematicians may try to steer clear of thesauruses, and bibliophiles may avoid calculators, but the thesaurus is actually linked to a mathematical tool. Around 1815, Roget invented the log log slide rule, a ruler-like device that allows users to easily calculate the roots and exponents of numbers. So while the inventor of the thesaurus was compiling words for his tome, he was also hard at work on the log log slide rule. A true jack-of-all-trades.

8. THE OXFORD ENGLISH DICTIONARY HAS ITS OWN HISTORICAL THESAURUS.

Synonyms for "love."
iStock

In 1965, a professor of English Language at Glasgow University suggested that scholars should create a historical thesaurus based on entries in the Oxford English Dictionary. The project was a massive undertaking, as people from multiple countries worked for 44 years to compile and classify words. Published in 2009, the Historical Thesaurus to the Oxford English Dictionary contains 800,000 words organized by theme and date. The thesaurus covers words and synonyms from Old English to the present day and lets readers discover when certain words were coined and how long they were commonly used.

9. ONE ARTIST TURNED HIS LOVE OF WORDS INTO A SERIES OF THESAURUS PAINTINGS.

Mel Bochner, "Crazy," 2004.
Mel Bochner, "Crazy," 2004. Francesca Castelli, Flickr // CC BY-NC-ND 2.0

In 2014, the Jewish Museum in New York showed a survey of conceptual artist Mel Bochner’s art. Bochner had incorporated words and synonyms in his paintings for years—which were collectively referred to as the thesaurus paintings—featuring word paintings and lists of synonyms on canvas. The brightly colored paintings feature different groups of English and Yiddish synonyms. According to Bochner, Vietnam and Iraq war veterans cried after seeing his thesaurus painting Die, which features words and phrases such as expire, perish, succumb, drop dead, croak, go belly up, pull the plug, and kick the bucket.

10. THERE'S AN URBAN THESAURUS FOR ALL YOUR SLANG SYNONYM NEEDS.

Copy of an Urban Dictionary book.
Effie Yang, Flickr // CC BY-NC-ND 2.0

Urban Dictionary helps people decipher the latest slang terms, but where should you go when you need a thesaurus of slang? Urban Thesaurus, of course! The site, which is not affiliated with Urban Dictionary, indexes millions of slang terms culled from slang dictionaries, then calculates usage correlations between the terms. Typing in the word money, for example, gives you an eclectic list of synonyms including scrilla, cheddar, mulah, coin, and bling.

This story originally ran in 2017.

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