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breastbone Syllabification: breast·bone
Pronunciation: /ˈbres(t)ˌbōn/

Definition of breastbone in English:


A thin, flat bone running down the center of the chest and connecting the ribs. Also called sternum.
Example sentences
  • To get to your heart the surgeon makes an incision down the middle of your chest and separates your breastbone.
  • The heart is a hollow, muscular organ that lies in the center of the chest under the breastbone.
  • All the blood cells are formed in the marrow of the flat bones such as the skull, breastbone and pelvis.
Definition of breastbone in:
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