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. 

Celebrate the Encyclopedia Britannica's 250th Birthday by Checking Out Its First Edition Online

Encyclopedia Britannica volumes on display at the New York Public Library
Encyclopedia Britannica volumes on display at the New York Public Library
Mario Tama/Getty Images

While those gold-embossed, multi-volume sets of the Encyclopedia Britannica were a feature of many an American childhood, the origins of the venerable reference work actually lie in Scotland. Two hundred and fifty years ago—on December 10, 1768—the first pages of the Britannica were published in Edinburgh. To celebrate the anniversary, the National Library of Scotland has put a rare first edition of the encyclopedia online.

The first edition was the brainchild of printer Colin Macfarquhar, engraver Andrew Bell, and the editor William Smellie. It was published in 100 weekly sections over three volumes (completed in 1771), but explicit engravings of midwifery scandalized some subscribers, and were ripped out on the orders of the Crown. The entries of the first edition—some of which ran to hundreds of pages—reflect the biases and preoccupations of their time: woman is defined as "the female of a man," while there are 39 pages devoted to horse diseases. Nevertheless, the work was a significant accomplishment that drew on at least 150 sources, from essays by famous philosophers to newspaper articles. It also featured 160 copperplate engravings by Bell.

The title page on the first edition of the Encyclopedia Britannica
The title page on the first edition of the Encyclopedia Britannica

In a statement from the National Library of Scotland, Rare Books Curator Robert Betteridge said, "By the 20th century Britannica was a household name throughout the English-speaking world, and what is especially interesting about this publication was that it had a distinctly Scottish viewpoint. The first edition emphasized two themes—modern science and Scottish identity, including ground-breaking and controversial articles on anatomy and Scots Law."

The first edition (which includes those ripped-out midwifery pages) will appear as part of an exhibit on the Scottish Enlightenment at the National Library of Scotland this summer. For now, you can view all three volumes of the first edition, from "A—the name of several rivers" to Zygophyllum, a genus in botany—online here.

[h/t American Libraries]

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