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.

When Are the Dog Days of Summer?

Dorottya_Mathe/iStock via Getty Images
Dorottya_Mathe/iStock via Getty Images

The official “dog days” of summer begin on July 3 and end on August 11. So how did this time frame earn its canine nickname? It turns out the phrase has nothing to do with the poor pooches who are forever seeking shade in the July heat, and everything to do with the nighttime sky.

Sirius, the Dog Star, is the brightest star in the sky. The ancient Greeks noticed that in the summer months, Sirius rose and set with the Sun, and they theorized that it was the bright, glowing Dog Star that was adding extra heat to the Earth in July and August.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

15 Pairs of Words That Surprisingly Come From the Same Source

Both flour and flower come from the same root word
Both flour and flower come from the same root word
Lena_Zajchikova/iStock via Getty Images

We take for granted that many English words have counterparts that sound related, but aren’t. Even though know and no sound the same, their meanings are so different we assume they have different etymological sources (which the spelling differences also suggest). However, sometimes words we might not expect to have anything in common historically do in fact go back to the same source. They’re called etymological doublets; here are 15 of them.

1. Flour/Flower

Flour, just like flower, came from French fleur. It was named that way because the part of the plant used to make it was considered the “flower of the grain,” the best part of it, taking away all the chaff and other impurities.

2. Lobster/Locust

Both go back to Latin locusta, for locust, which also turned into the French langouste and Old English lopustre. The lobster is the locust of the sea.

3. Inch/Ounce

Though one measures length and the other weight, they both go back to Latin uncia, meaning a twelfth part. The original ounce was 1/12th of a pound.

4. Of/Off

Of and off were once the exact same word but in a stressed vs. unstressed pronunciation. It wasn’t until the 17th century that they developed different uses to the point where they were considered different words.

5. Etiquette/Ticket

Etiquette was a French word for a note attached to something that listed its contents. It was borrowed into English as ticket and into Spanish as etiqueta, where it came to be associated with the listed rules of protocol for the Spanish royal court. It then came back into French and English with the social protocol meaning.

6. Costume/Custom

Both come from Latin consuetudinem, meaning "accustomed to," or "habituated." Both referred to the general habits of a group, including how they dress, among other things. Costume wasn’t explicitly connected to just the dress sense until the 1800s.

7. Species/Spices

Both come from Latin specie, for "appearance" or "form." Spice came into English first, from Old French espice. Species was later borrowed directly from Latin.

8. Reward/Regard

In Anglo-Norman, reward and regard were alternate pronunciations of the same thing. While the g version took on the senses of "to look at," "give attention to," and also "to merit, esteem, or respect," the w version settled into the current sense of giving something on merit.

9. Dainty/Dignity

The Latin word dignus meant "worthy." While dignity refers to a sense of "worthy" that includes serious notions of honor, respect, and rank, in dainty, dignus lives on in the sense of being worthy for being delightful, precious, and pleasing.

10. Naïve/Native

Both come from Latin nativus, meaning innate, natural. Naïve is "natural" in the sense of being unspoiled and native is an innate belonging to an origin.

11. Shirt/Skirt

The ancestor of the Old English scyrte developed into a word for the upper part of an undergarment in many Germanic languages, but it’s not entirely clear how it also developed into the skirt word for a lower garment in English.

12. Tradition/Treason

Tradition is from the Latin tradere, for the act of handing over or handing down. Treason also comes from tradere, with the sense of handing over or delivering. The tray in betray also goes back to this sense of tradere.

13. Tulip/Turban

Both are approximations of the Persian word for turban, dulband, which a tulip was said to resemble.

14. Maneuver/Manure

Maneuver comes from the Latin manu + operari, to work by hand. But so does manure, which was originally a verb meaning to "till the land."

15. Grammar/Glamour

Grammar goes all the way back to Latin and Greek, where it referred to all aspects of the study of literature. In the Middle Ages, it came to be associated with just the linguistic parts, and particularly with the study of Latin. The fancy, educated class studied Latin, and also things like magic and astrology, so the word grammar sometimes referred to that aspect too. A mispronounced version, glamour, went on to stand for the magical, enchanting quality we use it for today.

This list was first published in 2015 and republished in 2019.

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