1) Endoscope 2) Flexible sigmoidoscope 1) Proctosigmoidoscope 
instrument for examining the interior of the rectum and sigmoid colon
A thin, tube-like instrument used to examine the inside of the colon. A sigmoidoscope has a light and a lens for viewing and may have a tool to remove tissue.
An instrument (telescope) passed through the anus (back passage) to examine the lower bowel.
<instrument> A lighted instrument used to view the inside of the lower colon. ... (12 Dec 1998) ... 
(sig-moi´do-skōp) an endoscope for use in sigmoidoscopy.
A long, flexible instrument used in a sigmoidoscopy examination. See sigmoidoscopy section.
Type: Term Pronunciation: sig-moy′dō-skōp Definitions: 1. An endoscope for viewing the lumen of the sigmoid colon. Synonyms: sigmoscope
Sigmoidoscope: A thin lighted instrument used to view the inside of the rectum and lower colon.
A sigmoidoscope is a long tubular speculum used for sigmoidoscopy, that is a form of endoscopy involving the examination of the upper regions of the rectum and the sigmoid or pelvic colon.
[n] - an endoscope (a flexible fiberoptic probe) for examining the sigmoid colon
sigmoidoscope A fiber-optic tubular instrument inserted through the anus for examining the interior of the rectum and sigmoid (lower) colon.
flexible sigmoidoscope noun an endoscope (a flexible fiberoptic probe) for examining the sigmoid colon