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chemotherapy che·mo·ther·a·py (kē'mō-thěr'ə-pē, kěm'ō-)
The treatment of cancer using specific chemical agents or drugs that are selectively destructive to malignant cells and tissues.
The treatment of disease using chemical agents or drugs that are selectively toxic to the causative agent of the disease, such as a virus or other microorganism.
Note: There are often side effects to chemotherapy, a common one being the temporary loss of hair.