IPA: /mæˈstɛktəmi/
KK: /mæˈstɛktəmi/
A medical procedure where all or part of a breast is surgically removed, often done to treat breast cancer.
After her diagnosis, she decided to undergo a mastectomy to remove the affected tissue.
Mastectomy is formed from "mastos" (meaning breast) and "-ectomy" (meaning surgical removal). The word describes the surgical procedure of removing a breast.
Think of 'mastos' for breast and '-ectomy' for removal — that's why a mastectomy means the removal of a breast.