1) Procto- 
(from the article `diagnosis`) Colorectal cancer is the second leading cause of death from cancer in the United States. This disease is preventable if adenomatous polyps, ...
Examination of the lower colon using a sigmoidoscope, inserted into the rectum. A sigmoidoscope is a thin, tube-like instrument with a light and a lens for viewing. It may also have a tool to remove tissue to be checked under a microscope for signs of disease. Also called sigmoidoscopy.
An examination of the rectum and the lower part of the colon using a thin, lighted instrument called a sigmoidoscope. ... (12 Dec 1998) ... 
(prok″to-sig″moi-dos´kә-pe) examination of the rectum and the sigmoid colon with the sigmoidoscope.
Type: Term Pronunciation: prok′tō-sig′moy-dos′kŏ-pē Definitions: 1. Direct inspection through a sigmoidoscope of the rectum and sigmoid colon.
Proctosigmoidoscopy: See: Sigmoidoscopy.
proctosigmoidoscopy The examination of the rectum and sigmoid with the sigmoidoscope.
sigmoidoscopy.