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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.

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'Froyo,' 'Troll,' and 'Sriracha' Added to the Merriam-Webster Dictionary
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Looking for the right word to describe the time you spend drinking before heading out to a party, or a faster way to say “frozen yogurt?" Merriam-Webster is here to help. The 189-year-old English vocabulary giant has just added 250 new words and definitions to their online dictionary, including pregame and froyo.

New words come and go quickly, and it’s Merriam-Webster’s job to keep tabs on the terms that have staying power. “As always, the expansion of the dictionary mirrors the expansion of the language, and reaches into all the various cubbies and corners of the lexicon,” they wrote in their announcement.

Froyo is just one of the recent additions to come from the culinary world. Bibimbap, a Korean rice dish; choux pastry, a type of dough; and sriracha, a Thai chili sauce that’s been around for decades but has just recently exploded in the U.S., are now all listed on Merriam-Webster's website.

Of course, the internet was once again a major contributor to this most recent batch of words. Some new terms, like ransomware (“malware that requires the victim to pay a ransom to access encrypted files”) come from the tech world, while words like troll ("to harass, criticize, or antagonize [someone] especially by provocatively disparaging or mocking public statements, postings, or acts”) were born on social media. Then there’s the Internet of Things, a concept that shifts the web off our phones and computers and into our appliances.

Hive mind, dog whistle, and working memory are just a few of the new entries to receive the Merriam-Webster stamp of approval. To learn more about how some words make it into the dictionary while others get left out, check these behind-the-scenes secrets of dictionary editors.

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How New Words Become Mainstream
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If you used the words jeggings, muggle, or binge-watch in a sentence 30 years ago, you would have likely been met with stares of confusion. But today these words are common enough to hold spots in the Oxford English Dictionary. Such lingo is a sign that English, as well as any other modern language, is constantly evolving. But the path a word takes to enter the general lexicon isn’t always a straightforward one.

In the video below, TED-Ed lays out how some new words become part of our everyday speech while others fade into obscurity. Some words used by English speakers are borrowed from other languages, like mosquito (Spanish), avatar (Sanskrit), and prairie (French). Other “new” words are actually old ones that have developed different meanings over time. Nice, for example, used to only mean silly, foolish, or ignorant, and meat was used as blanket term to describe any solid food given to livestock.

The internet alone is responsible for a whole new section of our vocabulary, but even the words most exclusive to the web aren’t always original. For instance, the word meme was first used by Richard Dawkins in his 1976 book The Selfish Gene.

To learn more about the true origins of the words we use on a regular basis, check out the full story from TED-Ed below.

[h/t TED-Ed]

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