- Zoology. an S-shaped curve in a body part.
- Also called sigmoid colon. an S-shaped curve of the large intestine between the descending colon and the rectum.
Origin of sigmoid flexure
First recorded in 1780–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- zoology an S-shaped curve, as in the necks of certain birds
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
- The S-shaped section of the colon between the pelvic brim and the third sacral segment, continuous with the rectum.sigmoid colon
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.