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Otomy
The suffix ‘-otomy’ is derived from the Greek suffix τόμος, -tómos, “meaning cutting, sharp, or separate”.
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Ectomy
The surgical terminology suffix “-ectomy” was taken from Greek εκ-τομια = “act of cutting out”. It means surgical removal of something, usually from inside the body.
Wikipedia
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Ectomy (noun)
Any operation involving surgical excision or removal.
Wiktionary