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
Related formssig·moi·dal·ly, adverbpost·sig·moid, adjectivepost·sig·moi·dal, adjective
First recorded in 1660–70, sigmoid
is from the Greek
shaped like a sigma. See sigma
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for sigmoidcurvaceous
Examples from the Web for sigmoid
Historical Examples of sigmoid
Sigmoid, curved in two directions, like the letter S, or the Greek sigma.
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.
British Dictionary definitions for sigmoid
adjective Also: sigmoidal
shaped like the letter S
of or relating to the sigmoid colon of the large intestine
Word Origin for sigmoid
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
"shaped like a C" (1660s) or "shaped like an S" (1786), from sigma (q.v.) + -oid. Especially of the flexure of the colon (1891).
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.