sigmoid flexure

noun
1.
Zoology. an S -shaped curve in a body part.
2.
Also called sigmoid colon. an S -shaped curve of the large intestine between the descending colon and the rectum.

Origin:
1780–90

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Collins
World English Dictionary
sigmoid flexure
 
n
zoology an S-shaped curve, as in the necks of certain birds

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

sigmoid flexure n.
The S-shaped section of the colon between the pelvic brim and the third sacral segment, continuous with the rectum. Also called sigmoid colon.

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
The sigmoid flexure is gently curved, forming a slight binding.
Neither a true sigmoid flexure nor an appendix are present.
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