"Natch bone" is a term used in horse anatomy to refer to the carpal or knee bone. Synonyms for this term may include "carpal bone," "knee bone," or "radiocarpal bone." These bones are located in the lower leg and join the cannon bone and the small bones in the horse's fetlock joint. Other related terms used in equine anatomy include the "navicular bone" or the "sesamoid bones," which are small bones that support the joints in the fetlock and other areas of the horse's anatomy. Understanding these terms can be useful for horse owners and handlers in caring for their animals and identifying potential health issues.