sternal

Pertaining to the sternum (breastbone).

Of, relating to, or occurring near the sternum.

Pertaining to the sternum.

• s. puncture — insertion of a hollow needle into the manubrium of the sternum for the purpose of obtaining a sample of bone marrow. The sternum is chosen because of its accessibility and because it is a flat bone in many species.
• s. recumbency — the animal lies down on its ventral thoracic and abdominal walls, usually with the legs tucked underneath the body; the sagittal plane is vertical and the head is in a vertical plane. Called also dorsal recumbency.

The adjective has one meaning:

Meaning #1: of or relating to or near the sternum
  Pertains to noun: sternum (meaning #1)