This stuff can be boring. Xanthan is a water-soluble natural gum produced by the fermentation of sugar with certain microorganisms and used as a binder, extender, or stabilizer in foods and other products. Unless you’re a chemist, it probably has all of the appeal of an emulsifier. 

OK, so not much to work with there, but the last entry in the W section is wyvern, which is a winged two-legged dragon having the hinder part of a serpent with a barded tail. So, we’ve got that going for us (he said, wistfully).

Only Y and Z to go now, as we near the end.

There are not even two and a half pages of X words in my Webster’s Dictionary. Given this book was first produced in 2001, is it reasonable to assume there are a few more words that begin with X by now?