Chemotherapy (noun)

1. A type of treatment that uses chemicals to kill cancer cells.
2. The treatment of a disease by the use of drugs, especially to combat cancer.

Origin:

From the greek word "chemo-" meaning "drug" and "-therapy" meaning "treatment".

Examples:

1. The patient is currently undergoing chemotherapy for their cancer.
2. The doctor recommended chemotherapy in addition to surgery to remove the tumor.
3. Chemotherapy can cause side effects such as hair loss and nausea.
4. Chemotherapy is one of the most common treatments for Hodgkin's lymphoma.
5. The researchers are testing a new type of chemotherapy that targets only cancer cells.