D defs.my
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Entry 1 sense Webster, 1913

Sigmoid

/sĭg'-moidˌ/ · Sig·moid · IPA /ˈsɪɡ.mɔɪd/
01 a. Curved in two directions, like the letter S, or the Greek ς.
  1. 1.
    Curved in two directions, like the letter S, or the Greek ς.
Phrases & compounds
Sigmoid flexure — the last curve of the colon before it terminates in the rectum. See Illust. under Digestive.
Sigmoid valves — See Semilunar valves, under Semilunar.