Definition of -ectomy combining form from the Oxford Advanced Learner's Dictionary

 

-ectomy

 combining form
combining form
 
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(in nouns) a medical operation in which part of the body is removed appendectomy (= removal of the appendix) Word Originfrom Greek ektomē ‘excision’, from ek ‘out’ + temnein ‘to cut’.
See the Oxford Advanced American Dictionary entry: -ectomy