Etymology
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Words related to -ectomy

ex- 
word-forming element, in English meaning usually "out of, from," but also "upwards, completely, deprive of, without," and "former;" from Latin ex "out of, from within; from which time, since; according to; in regard to," from PIE *eghs "out" (source also of Gaulish ex-, Old Irish ess-, Old Church Slavonic izu, Russian iz). In some cases also from Greek cognate ex, ek. PIE *eghs had comparative form *eks-tero and superlative *eks-t(e)r-emo-. Often reduced to e- before -b-, -d-, -g-, consonantal -i-, -l-, -m-, -n-, -v- (as in elude, emerge, evaporate, etc.).
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*tem- 
also *temə-, Proto-Indo-European root meaning "to cut."

It forms all or part of: anatomy; atom; contemplate; contemplation; diatom; dichotomy; -ectomy; entomolite; entomology; entomophagous; epitome; phlebotomy; temple (n.1) "building for worship;" tmesis; tome; -tomy; tonsorial; tonsure.

It is the hypothetical source of/evidence for its existence is provided by: Greek temnein "to cut," tomos "volume, section of a book," originally "a section, piece cut off;" Old Church Slavonic tina "to cleave, split;" Middle Irish tamnaim "I cut off," Welsh tam "morsel."
appendectomy (n.)

1891, a hybrid from appendix in the anatomical sense + -ectomy "a cutting, surgical removal."

clitoridectomy (n.)

"surgical removal of the clitoris from the body," 1866, from Latinized stem of Greek kleitoris (see clitoris) + -ectomy "a cutting, surgical removal." Originally in reference to a proposed cure for hysteria.

colectomy (n.)

"surgical excision of part of the colon," 1882, from combining form of colon (n.2) + -ectomy "a cutting, surgical removal."

cystectomy (n.)

1883; see cyst + -ectomy "a cutting out."

gastrectomy (n.)
1881, from gastro- "stomach" + -ectomy "a cutting out."
hysterectomy (n.)
"surgical excision of the uterus," 1881, coined in English from Greek hystera "womb" (see uterus) + -ectomy.
mastectomy (n.)

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

nephrectomy (n.)

"excision of a kidney," 1880, from nephro- "kidney" + -ectomy "a cutting out."