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resection (ri-sek-shŏn) n. surgical removal of a portion of any part of the body. submucous r. removal of part of the cartilage septum of the nose that has become deviated, usually by injury. transurethral r. of the prostate (TURP) an operation performed when the prostate gland becomes enlarged. It involves removal of portions of the gland through the urethra using an instrument called a resectoscope.