[ 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.

Nearby words

  1. sigma factor,
  2. sigma particle,
  3. sigmate,
  4. sigmation,
  5. sigmatism,
  6. sigmoid artery,
  7. sigmoid colon,
  8. sigmoid flexure,
  9. sigmoid sinus,
  10. sigmoid vein

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 formssig·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

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

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.