Etymology
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mastectomy (n.)

surgical removal of a breast, 1909, from masto- "(woman's) breast" + -ectomy "a cutting."

updated on December 01, 2018

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Definitions of mastectomy from WordNet

mastectomy (n.)
surgical removal of a breast to remove a malignant tumor;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.