lumpectomy
From Longman Dictionary of Contemporary EnglishRelated topics: Hospitallumpectomylump‧ec‧to‧my /lʌmpˈektəmi/ noun (plural lumpectomies) [countable] MHan operation in which a tumour is removed from someone’s body, especially from a woman’s breastExamples from the Corpuslumpectomy• This woman was 37 years old, and she too had had a lumpectomy and radiotherapy four years earlier.• But along the Interstate 91 corridor of New Hampshire and Vermont, fewer than 20 percent of such patients have lumpectomies.