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Definition of breastbone

breastbone

/ˈbrɛstˌboʊn/
breast · bone
Plural:breastbones
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breastbone Lexical Profile

breastbone Game Scores & Validity

• noun

1

A long, flat bone located in the center of the chest that connects with the collarbones and the cartilage of the upper ribs to protect the heart and lungs; the sternum.

Example

"During CPR, chest compressions are performed by pressing firmly on the lower half of the breastbone."

Synonyms
View all synonyms for breastbone

• Nearby Words

breakwater
bream
breast
breastbone
breasted
breastfeed
breastfeeder

Word Origin & Etymology

From Middle English brest-bon, continuing Old English breostban, a compound of breost ('breast, chest') and ban ('bone').

Cite this Entry

Wordmom. (2026). Definition of Breastbone. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/breastbone
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