The suffix (-ectomy) means to remove or excise, as typically done in a surgical procedure. For example, "appendectomy" (append-ectomy) means surgical removal of the appendix, typically due to appendicitis. The appendix is a small, tubular organ that extends from the large intestine. Related suffixes include (-otomy) and (-ostomy). The suffix (-otomy) refers to cutting or making an incision, while (-ostomy) refers to a surgical creation of an opening in an organ for the removal of waste.

Source: Thought Co.