40 Words That Start With X

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When the lexicographer Dr. Samuel Johnson put together his Dictionary of the English Language in 1755, there weren't a lot of words that started with X; he even included a disclaimer at the bottom of page 2308 that read, “X is a letter which though found in Saxon words, begins no word in the English language.” Noah Webster went one better when he published his Compendious Dictionary in 1806 that included a single X-word, xebec, defined as “a small three-masted vessel in the Mediterranean Sea.” Although, by the time he compiled his landmark American Dictionary in 1828, that total had risen to 13.

X has never been a common initial letter in English, and even with today’s enormous vocabulary you can still only expect around 0.02 percent of the words in a dictionary to be listed under it. But why not try boosting your vocabulary with these 40 words that start with X.

1. X

On its own, the letter X is listed in the Oxford English Dictionary as a verb meaning “to cross out a single letter of type.” X. X. in Victorian slang meant “double-excellent,” while X. X. X. described anything that was “treble excellent.”

2. XANTHIPPE

Xanthippe was the name of Socrates’ wife, who, thanks to a number of Ancient Greek caricatures, had a reputation for henpecking, overbearing behavior. Consequently her name can be used as a byword for any ill-tempered or cantankerous woman or wife—as used in Shakespeare’s Taming of the Shrew.

3. XANTHOCOMIC

Xanthos was the Ancient Greek word for “yellow,” and as such is the root of a number of mainly scientific words referring to yellow-colored things. So, if you’re xanthocomic, you have yellow hair; if you’re xanthocroic you have fair hair and pale skin; and if you’re xanthodontous, you have yellow teeth.

4. X-CATCHER

In old naval slang, an X-catcher or X-chaser was someone who was good at math—literally someone good at working out the value of x.

5. X-DIVISION

Victorian slang for criminals or pickpockets, or people who make a living by some underhand means.

6. X-DOUBLE-MINUS

1960s slang for something really, really terrible.

7. XENAGOGUE

Derived from the same root as xenophobia, a xenagogue is someone whose job it is to conduct strangers or to act as a guide while…

8. XENAGOGY

…a xenagogy is a guidebook.

9. XENIAL

The adjective xenial is used to describe a friendly relationship between two parties, in particular between a hospitable host and his or her guests, or diplomatically between two countries.

10. XENIATROPHOBIA

Don’t like going to see doctors you don’t know? Then you’re xeniatrophobic.

11. XENIUM

A xenium is a gift or offering given to a stranger, which in its native Ancient Greece would once have been a lavish feast or a refreshing spread of food and fruit. In the 19th century art world, however, xenium came to refer to a still-life painting depicting something like a extravagant display of food or a bowl of fruit.

12. XENIZATION

A 19th century word meaning “the act of traveling as a stranger.”

13. XENOCRACY

A government formed by foreigners or outsiders is a xenocracy. A member of one is a xenocrat.

14. XENODOCHEIONOLOGY

Defined as “the lore of hotels and inns” by Merriam-Webster.

15. XENODOCHIUM

A guesthouse or hostel, or any similar stopping place for travelers or pilgrims.

16. XENODOCHY

A 17th century word for hospitality. If you’re xenodochial then you like to entertain strangers.

17. XENOGLOSSY

The ability to speak a language that you’ve apparently never learnt.

18. XENOLOGY

The scientific study of extraterrestrial phenomena is xenology. The study of extraterrestrial life forms is xenobiology.

19. XENOMANIA

The opposite of xenophobia is xenomania or xenophilia, namely an intense enthusiasm or fondness for anything or anyone foreign.

20. XENOMORPH

Something unusually or irregularly shaped is a xenomorph—which is why it’s become another name for the eponymous creature in the Alien film franchise.

21. XENOTRANSPLANTATION

Transplanting organic matter from a non-human into a human (like a pig’s heart valve into a human heart) is called xenotransplantation. Whatever it is that’s transplanted is called the xenograft.

22. XERIC

An ecological term used to describe anywhere extremely dry or arid. If it’s xerothermic, then it’s both dry and hot.

23. XERISCAPE

If you live in a xeric area, then you’ll have to xeriscape your garden. It’s the deliberate use of plants that need relatively little moisture or irrigation to landscape an arid location.

24. XEROCHILIA

The medical name for having dry lips. Having a dry mouth is xerostomia.

25. XEROCOPY

A xerographic copy of a document—or, to put it another way, a photocopy.

26. XEROPHAGY

The eating of dry food is xerophagy. It mightn’t sound like it, but it was originally a religious term.

27. XESTURGY

The proper name for the process of polishing.

28. XILINOUS

Something described as xilinous resembles or feels like cotton…

29. XIPHOID

…while something described as xiphoid resembles a sword.

30. XOANON

Derived from the Greek for “carve” or “scrape,” a xoanon is a carved idol of a deity.

31. XTAL

An abbreviation of “crystal,” according to the OED.

32. XYLOGRAPHER

A 19th century word for a wood engraver.

33. XYLOID

Why say that something is “woody” when you can say that it’s xyloid?

34. XYLOPOLIST

A 17th century formal name for a timber merchant.

35. XYLOTOMOUS

Describes anything or anyone particularly good at wood-cutting or wood-boring.

36. XYRESIC

Means “razor-sharp.”

37. XYROPHOBIA

The fear of being close to or touching sharp implements.

38. XYLANTHRAX

Nowhere near as nasty as it sounds, this is just an old name for what we now call charcoal.

39. XYSTUS

A type of covered walkway or portico.

40. X.Y.Z.

Late 19th century slang for a journalist who takes on any work going, or else 18th century slang for a dandyish or “exquisite” young man.

11 Words That Started Out As Spelling Mistakes

A woman sneezing, which in Middle English would have been called a fneze instead.
A woman sneezing, which in Middle English would have been called a fneze instead.
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The word irregardless might not be to everyone’s taste, but there’s no denying that if you were to use it in a sentence, you’d be perfectly understood—and that’s more than enough evidence for it to have been accepted into many dictionaries (albeit flagged as non-standard or informal), including Oxford Dictionaries, Merriam-Webster, and even the hallowed Oxford English Dictionary, which has so far been able to trace it back as far as 1912. So despite it having its origins in an error, and irregardless of what you might think of it, there’s no denying irregardless is indeed a word—and it’s by no means alone.

1. Expediate

Meaning “to hasten” or “to complete something promptly,” the verb expediate is thought to have been invented by accident in the early 1600s when the adjective form of expedite, meaning “ready for action” or “alert,” was misspelled in an essay by the English politician Sir Edwin Sandys (it was later corrected).

2. Culprit

There are several different accounts of the origin of culprit, but all of them seem to agree that the word was born out of a mistake. Back when French was still the language of the law in England in the Middle Ages (a hangover from the days of the Norman Conquest), the phrase Culpable, prest d’averrer nostre bille—literally “guilty, ready to prove our case”—was apparently the stock reply given by the Clerk of the Crown whenever a defendant gave a plea of not guilty. In the court records, this fairly long-winded phrase was often abbreviated just to cul. prit., and, as the Oxford English Dictionary explains, “by a fortuitous or ignorant running together of the two,” the word culprit was born.

3. Despatch

Despatch is a chiefly British English variant of dispatch, often used only in formal contexts like the name of the political despatch box in the House of Commons. The e spelling apparently began as a phonetic variation of the original I spelling, but after Samuel Johnson included it in his Dictionary of the English Language in 1755, its use was legitimized and thrived in the 19th century. Because Johnson himself preferred the I spelling in his own writings, however, it's supposed that he included the e spelling by mistake and inadvertently popularized the error.

4. Nickname

Nicknames were originally called eke names, with the verb eke used here in the sense of “to make longer” or “to provide an addition.” Sometime in the 13th century, however, “an eke-name” was mistakenly interpreted as “a neke-name,” and the N permanently jumped across from the indefinite article an to the verb eke. The same error—known linguistically as “rebracketing” or “junctural metanalysis”—is responsible for nadders, numpires, and naprons all losing their initial Ns in the Middle English period.

5. Ammunition

Ammunition derives from a faulty division of the French la munition, which was incorrectly misheard as l'amonition by French soldiers in the Middle Ages, and it was this mistaken form that was borrowed into English in the 1600s.

6. Scandinavia

Scandinavia was originally called Scadinavia, without the first N, and is thought to take its name from an island, perhaps now part of the Swedish mainland, called Scadia. According to the Oxford English Dictionary, the extra N was added in error by the Roman scholar Pliny the Elder, and has remained in place ever since.

7. Syllabus

If all had gone to plan in the history of the word syllabus, those two Ls should really be Ts: Syllabus was coined as a Latin misreading of an Ancient Greek word, sittybos, meaning “a table of contents.”

8. Sneeze

Oddly, sneeze was spelled with an F and not an S, fneze, in Middle English, which gives weight to the theory that it was probably originally coined onomatopoeically. At least one explanation of why the letter changed suggests that this F inadvertently became an S sometime in the 15th century due to continual misreadings of the long lowercase f as the old-fashioned long S character, ſ.

9. Ptarmigan

The ptarmigan is a bird of the grouse family, found in mountainous and high-latitude environments. Its bizarre name with its initial silent P is something of a mystery, as the original Scots word from which it derives, tarmachan, shows no evidence of it and there’s little reason why one should ever have to have been added to it—except, of course, if it were a mistake. The P spelling first emerged in the late 1600s, and is thought to have been a mistaken or misguided attempt to ally the name to the Greek word for a wing, pteron, and eventually this unusual P spelling replaced the original one.

10. Sherry

Sherry takes its name from the southern Spanish port of Xeres (now Jerez de la Frontera in Cádiz) and was originally known as vino de Xeres, or “wine of Xeres.” This name then morphed into sherris when sherry first began to be talked about in English in the early 17th century, but because of that final S, it didn’t take long for that to be misinterpreted as a plural. Ultimately, a mistaken singular form, sherry, emerged entirely by mistake in the early 1600s.

11. Pea

Another word that developed from a plural-that-actually-wasn’t is pea. One pea was known as a pease in Middle English, but because of that final “s” sound, pease was quickly misinterpreted as a plural, giving rise to a misguided singular form, pea, in the 17th century. The actual plural of pease in Middle English, incidentally, was pesen.

This list first ran in 2016.

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