What a letter.
I can only come up with words like X-rated (which we don't talk about here because this is a wholesome blog where kiddos may be reading ;) )
X-Ray is another word that is decent and technical.
The name Xander is one I used in a past story for one of my heros. I borrowed that off Buffy the Vampire Slayer and the kid named Xander. Do you remember him?
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What X words have I missed that relate to books, movies and TV?