The sternum or breastbone is an essential part of the human body, located in the midline of the chest. It is a flat, long bone that connects the ribs and helps protect vital organs such as the heart and lungs. Some synonyms for the sternum or breastbone include chest bone, thorax bone, mid-chest bone, or breastplate. These terms all refer to the same bone but can be used interchangeably depending on the context. Knowing different synonyms for sternum or breastbone can help in medical discussions or identifying the location of an injury in the chest area.