sternum
Cross references: 1. breastbone ster.num \'st*r-n*m\ \-n*\ n or sternums or ster.na [NL, fr. Gk sternon chest, breastbone; akin to OHG stirna forehead,] pl L sternere to spread out - more at STREW : a compound ventral bone or cartilage connecting the ribs or the shoulder girdle or both