sternum

US /ˈstɝː.nəm/
UK /ˈstɝː.nəm/
"sternum" picture
1.

a bone or cartilage plate that forms the middle of the front of the chest and is connected to the ribs and collarbone

:
The doctor examined the patient's sternum for any abnormalities.
A strong blow to the sternum can be very painful.