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sigmoid

[sig-moid] /ˈsɪg mɔɪd/
adjective
1.
shaped like the letter C.
2.
shaped like the letter S.
3.
of, relating to, or situated near the sigmoid flexure of the large intestine.
Sometimes, sigmoidal [sig-moi-dl] /sɪgˈmɔɪ dl/ (Show IPA).
Origin of sigmoid
1660-1670
First recorded in 1660-70, sigmoid is from the Greek word sigmoeidḗs shaped like a sigma. See sigma, -oid
Related forms
sigmoidally, adverb
postsigmoid, adjective
postsigmoidal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for sigmoidal

sigmoid

/ˈsɪɡmɔɪd/
adjective
1.
shaped like the letter S
2.
of or relating to the sigmoid colon of the large intestine
noun
3.
Word Origin
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
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Word Origin and History for sigmoidal

sigmoid

adj.

"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
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sigmoidal in Medicine

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

  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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