mastectomy

American  

[ma-stek-tuh-mee] / mæˈstɛk tə mi /

noun

Surgery.

plural

mastectomies

1. the operation of removing all or part of the breast or mamma.

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mastectomy British  

/ mæˈstɛktəmɪ /

noun

1. the surgical removal of a breast

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mastectomy Scientific  

/ mă-stĕk′tə-mē /

1. Surgical removal of all or part of a breast, performed as a treatment for cancer.

2. ◆ A radical mastectomy includes excision of the underlying pectoral muscles and regional lymph nodes.

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mastectomy Cultural  

1. The surgical removal of a breast.

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Other Word Forms

• postmastectomy adjective

Etymology

Origin of mastectomy

First recorded in 1920–25; mast- + -ectomy

Example Sentences

Then, in 2024, Munn revealed she had been diagnosed the previous year with an aggressive form of breast cancer and had undergone multiple surgeries and a double mastectomy.

From The Wall Street Journal • Apr. 6, 2026

At 19, I had “top surgery”—a euphemism for an elective double mastectomy.

From The Wall Street Journal • Feb. 11, 2026

US actor Angelina Jolie revealed her double mastectomy scars in a photo shoot for Time France, in the magazine's first French edition that launched this week.

From Barron's • Dec. 15, 2025

From there, Eisman was diagnosed, underwent a double mastectomy and is being treated with two types of chemotherapy: Taxol and AC, or Adriamycin and cyclophosphamide.

From MarketWatch • Dec. 12, 2025

They put her in a hospital, where Marie had a radical mastectomy, chemotherapy and radiation.

From How and When to Be Your Own Doctor by Solomon, Steve