What is the medical term meaning complete removal of an organ or tissue?

Answer 1

If it is a limb, the term is usually 'amputation,' but the medical term is usually the Latin or Greek name for the body part with the suffix '-ectomy.' An appendectomy, for instance, is the removal of the vermiform appendix.

Answer 2

Excision means complete removal of an organ or tissue. If forming a word from combining forms, the organ's or tissue's word part followed by -ectomy, from -ec- being a variant of e- meaning "out"(most of the time) + -tomy meaing "cut". i.e. appendectomy, laminectomy. If the word ends with just -tomy it "usually" means incision and not excision.
Excision, perhaps, or -ectomy (for example, the complete removal of, say, the heart would be a cardiectomy).

Answer 3

Resection