- shaped like the letter C.
- shaped like the letter S.
- of, relating to, or situated near the sigmoid flexure of the large intestine.
Sometimes sig·moi·dal [sig-moi-dl] /sɪgˈmɔɪ dl/.
Origin of sigmoid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for sigmoid
Sigmoid, curved in two directions, like the letter S, or the Greek sigma.The Elements of Botany
It is usually found in the lower part of the ileum, the ccum, sigmoid flexure, and other parts of the colon.
It was the practice with O'Beirne,71 Hare,72 and others to inject fluid by a long flexible tube passed beyond the sigmoid flexure.
Its most common site is the sigmoid flexure, and next in point of frequency the ccum.
It is most often observed in the sigmoid flexure and ccum, as are the other forms of carcinoma.
- shaped like the letter S
- of or relating to the sigmoid colon of the large intestine
- See sigmoid colon
C17: from Greek sigmoeidēs sigma-shaped
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
Word Origin and History for sigmoid
Online Etymology Dictionary, © 2010 Douglas Harper
- Having the shape of the letter S.
- Of or relating to the sigmoid flexure of the colon.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.