Cancer (noun)

1. A group of diseases characterized by the uncontrolled growth and spread of abnormal cells in the body.
2. A malignant and invasive growth or tumor that may spread to other parts of the body.
3. Something harmful or destructive that spreads rapidly.

Origin:

The word "cancer" is derived from the latin word "carcinoma", which means "crab". this is because early doctors thought that the spreading and tenacious nature of cancerous tumors reminded them of the tenacious claws of a crab. the word has been in use in english since the 15th century.

Examples:

1. She was diagnosed with breast cancer and had to undergo surgery and chemotherapy.
2. The cancer had spread to his liver and lungs, making it more difficult to treat.
3. Early detection and treatment are crucial for improving the chances of survival in cancer patients.
4. The smoking ban was implemented to reduce the risk of lung cancer.
5. The company's policies were criticized for promoting a culture of toxic behavior, like a cancer in the organization.