[ sig-moid ]
/ ˈsɪg mɔɪd /


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

First recorded in 1660–70, sigmoid is from the Greek word sigmoeidḗs shaped like a sigma. See sigma, -oid

Related forms

sig·moi·dal·ly, adverbpost·sig·moid, adjectivepost·sig·moi·dal, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for sigmoid

British Dictionary definitions for sigmoid


/ (ˈsɪɡmɔɪd) /

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

Medicine definitions for sigmoid


[ sĭgmoid′ ]


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.