shaped like the letter C.
shaped like the letter S.
of, pertaining to, or situated near the sigmoid flexure of the large intestine.
Also, sigmoidal.

1660–70; < Greek sigmoeidḗs shaped like a sigma. See sigma, -oid

sigmoidally, adverb
postsigmoid, adjective
postsigmoidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sigmoid (ˈsɪɡmɔɪd)
1.  shaped like the letter S
2.  of or relating to the sigmoid colon of the large intestine
3.  See sigmoid colon
[C17: from Greek sigmoeidēs sigma-shaped]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

sigmoid sig·moid (sĭg'moid') or sig·moi·dal (sĭg-moid'l)

  1. Having the shape of the letter S.

  2. 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.
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Example sentences
In other words, a sigmoid can indeed be used as a reliable indicator of the
  likelihood that a particular region will erupt.
On it rest some coils of small intestine, and occasionally the distended
  sigmoid colon.
They are chiefly appended to the transverse and sigmoid parts of the colon.
The river flows in long sigmoid curves through an alluvial valley of no great
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