Etymology
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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).

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Definitions of sigmoid

sigmoid (adj.)
curved in two directions (like the letter S);
sigmoid (adj.)
of or relating to the sigmoid flexure in the large intestine;
Synonyms: sigmoidal
From wordnet.princeton.edu