x-word

noun3

1. •
   The word xenophobia.

   • Before one uses the X-word to describe people with less-liberal views on immigration, one should recall its meaning – an extreme or irrational dislike or fear of people from other countries. — 2014
2. •
   One of a group of fundamental English auxiliary or modal verb forms.

   • To change a statement into a question that can be answered “yes” or “no,” one must place an X-word (one of twenty-three auxiliaries or modals) at the beginning of the sentence. — 1969
3. •
   Abbreviation of crossword.

   • After Dieter got up from solving his Stern-Xword puzzle―I was hanging over his shoulders ... in order to fill some ... spaces in the crossword puzzle[.] — 2003