| | Conditions Treatments | Bones, Joints Muscles A body part that starts with x? The only body part that starts with X is the xiphoid process, which is the small, cartilage-tipped projection at the lower end of the sternum, the breastbone. Bones, Joints Muscles - Related Articles How to Abbreviate Delayed Release Is Remission Possible With RA? Can I Take Allergy Medication If Pregnant? What causes a psuedoaneurysm? How to Add Grains to a No-Carb Diet Is Excessive Flatulence Bad for You? The Effects of a Secondary Chain Smoker