a rigid or flexible endoscope for visual examination of the rectum and sigmoid colon.
Also called proctosigmoidoscope.

1900–05; sigmoid (flexure) + -o- + -scope

sigmoidoscopic [sig-moi-duh-skop-ik] , adjective
sigmoidoscopist [sig-moi-dos-kuh-pist] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sigmoidoscope (sɪɡˈmɔɪdəˌskəʊp)
an instrument incorporating a light for the direct observation of the colon, rectum, and sigmoid flexure

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

sigmoidoscope sig·moid·o·scope (sĭg-moi'də-skōp')
A tubular instrument for visual examination of the sigmoid flexure.

sig'moid·os'co·py (sĭg'moi-dŏs'kə-pē) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
There may be some bloating or cramping caused by the air or by stretching of the bowel by the sigmoidoscope.
The discovery was made with a device called a sigmoidoscope, a tube containing a light source.
Examination of the lower colon using a sigmoidoscope, inserted into the rectum.
The sigmoidoscope can view almost half of the colon.
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