Definition of breastbone in English:

breastbone

Syllabification: breast·bone
Pronunciation: /ˈbrestˌbōn
 
/

noun

  • A thin, flat bone running down the center of the chest and connecting the ribs. Also called sternum.
    More 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.

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a slit made by cutting with a saw