Sternal

[Sarah]

Of or pertaining to the sternum; in the region of the sternum.Sternal ribs. See the Note under Rib, n., 1.

[Sarah]

adj. An overly thin woman whose sternum is excessively apparent
n. Attempting to achieve the corpse like showing of the sternum

[Sonia]

relating to or near the sternum (= the main bone at the centre of the chest)

[Mary Mallozziberg]

: of or relating to the sternum.