Sternum

n.	1.	(Anat.) A plate of cartilage, or a series of bony or cartilaginous plates or segments, in the median line of the pectoral skeleton of most vertebrates above fishes; the breastbone.
	2.	(Zool.) The ventral part of any one of the somites of an arthropod.

Noun

1.

sternum - the flat bone that articulates with the clavicles and the first seven pairs of ribs Synonyms: breastbone

axial skeleton, bone, breastbone, chest, corpus sternum, gladiolus, manubrium, os, pectus, thorax, xiphoid process