Breastbone (noun)

The long flat bone located in the center of the chest that helps protect the heart and lungs.

Origin:

Breastbone originated from early 17th century; from 'breast' + 'bone', meaning the long flat bone located in the center of the chest.

Examples:

1. He broke his breastbone in a fall from a ladder.
2. The breastbone is also known as the sternum.
3. The breastbone is a common site of pain in people with chest conditions.
4. A heart surgery involves cutting through the breastbone to access the heart.
5. The breastbone is connected to the rib bones, forming the front of the rib cage.