And Now We Pause for a Few Words
and Numbers that Begin with X
- Hatred or fear of foreigners: xenophobia.
- Garden that requires little or no water: xeriscape.
- Socrates’ wife: Xantippe, reputedly a shrew,
so a “xantippe” came to mean a scolding, nagging,
ill-tempered woman. On the other hand, she may have
been just a strong-willed person inclined to speak her mind.
- Number of pages the unabridged second edition of The Random House
Dictionary of the English Language devotes to words that start with x: II (i.e. 2). 
Compare with the number of pages said dictionary bestows on s: CLXXXVIII.
Or with the X on q. Even z gets VI. The XXIVth letter of the English alphabet,
x begins no bottom-word in English, though it wins plenty of work in porn
and in marking the spot.
- The process of dry photocopying that Chester Carlson invented in MCMXXXVIII:
xerography. More than XX companies and the U.S. military rejected Carlson’s
invention as redundant—“Why do we need a machine to copy stuff when we have
abundant people to copy stuff?”—before the Haloid Photographic Company took
a flyer and licensed it in MCMXLVI.
HPC changed its name to Haloid Xerox in MCMLVIII, then to just plain Xerox
in MCMLXI. 
- XIVth letter of the Greek alphabet: xi (ξ). In particle physics, a xi is a baryon
composed of three quarks, a quark being an elementary particle and thus
a fundamental constituent of matter (for now). 
- “Buttocks” in Otomi, an indigenous language of central Mexico: xiji.
Muchas gracias to the person or persons who agreed to express Otomi’s
voiceless alveopalatal fricative (the ⟨sh⟩ sound in, for example, “shiver”)
with the letter x.
- Mexican hairless dogs and a Tijuana soccer team: xoloitzcuintles,
“xolos” for short.“Xoloitzcuintle” combines two Nahuatl  words: Xolotl,
the dog-like Aztec deity who guards the sun during her nightly run
through the underworld; and itzcuīntli, the Nahuatl word for “dog.”
- Iron’s atomic number: XXVI, which is also the gematria  value of God.