Ah, the dreaded X. Whatever the challenge, it always seems to be the letter to avoid. If you have a favourite word in this letter, please add it. Foreign language words are welcome, (with translation) and American spellings are allowed. No abbreviations though.
I can thank my years in the Ambulance Service for this word. The Xiphoid is something we all have, as it is a small extension at the base of the sternum, the central bone of the chest. (Also known as the Xiphoid Process). When carrying out manual CPR, it is important to try not to break this arrow-shaped ossified cartilage.
This Ancient Greek word denotes a fear of outsiders, foreigners, or strangers. In modern use, it is generally understood to be a dislike of people from other countries. We have all seen a great deal of this going on, in recent years.
This is a colourless chemical used as a solvent I have no idea why I remember this word, but I do. It was probably part of some hazardous chemicals lecture I attended when working for the emergency services.
Short of resorting to a dictionary, this was the best I could do. The only other one I thought of was Xanadu, but that got a lot of use in my music (and film) challenge.