recto-, rect-

(Latin: straight [intestine], direct, right; that is, "the part of the large intestine that ends at the anus")

rectoscope
1. An instrument for examining the rectum consisting of a tube or speculum equipped with a light.
2. A tool consisting of a thin tube with a light source, used to examine the inside of the rectum.
rectoscopy
Endoscopic examination of the rectum.

It is used to locate, identify, and photograph pathologic alterations, to obtain biopsy material, and to perform other surgical interventions, and for the delivery of medication.

rectosigmoidectomy
The surgical excision of the rectum and sigmoid.
rectotomy
rectum
rectus