sigmoid

[sig-moid]

adjective

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 formssig·moi·dal·ly, adverbpost·sig·moid, adjectivepost·sig·moi·dal, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for sigmoidal

Historical Examples of sigmoidal

A sigmoidal fold, showing a bed xx in an overfold with arch (a), trough (t) and common limb c.
The Principles of Stratigraphical Geology
J. E. Marr

British Dictionary definitions for sigmoidal

sigmoid

adjective Also: sigmoidal

shaped like the letter S
of or relating to the sigmoid colon of the large intestine

noun

See sigmoid colon

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 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).

sigmoidal in Medicine

sigmoid

[sĭg′moid′]

adj.

Having the shape of the letter S.
Of or relating to the sigmoid flexure of the colon.