Webster's English Dictionary

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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