What is the medical term meaning the process of cutting back?

Debridement is a term for cutting back the devitalized areas of a wound or other lesion.

Tapering is a term applied to gradually cutting down on the dose of a medication.
(RE) is prefix for back

(CIS) is the combing form meaning to cut

(TOMY) is the process of cutting

It's resectomy.

resection

re - back

sect - to cut

ion - process