sigmoid

sigmoid
    adj 1: curved in two directions (like the letter S)
    2: of or relating to the sigmoid flexure in the large intestine
       [syn: {sigmoid}, {sigmoidal}]
    

Sigmoid \Sig"moid\, Sigmoidal \Sig*moid"al\, a. [Gr. ???; ???
   sigma + e'i^dos form, likeness: cf. F. sigmo["i]de.]
   Curved in two directions, like the letter S, or the Greek
   [sigmat].
   [1913 Webster]

   {Sigmoid flexure} (Anat.), the last curve of the colon before
      it terminates in the rectum. See Illust. under
      {Digestive}.

   {Sigmoid valves}. (Anat.) See {Semilunar valves}, under
      {Semilunar}.
      [1913 Webster]
    

59 Moby Thesaurus words for "sigmoid":
      Cynthian, S-shaped, ambagious, anfractuous, bicorn, circuitous,
      circumlocutory, convolutional, corniform, crescent,
      crescent-shaped, crescentic, crescentiform, crescentlike, falcate,
      falciform, flexuose, flexuous, horn-shaped, horned, involute,
      involuted, involutional, labyrinthine, lunar, lunate, luniform,
      lunular, mazy, meandering, meandrous, menisciform, meniscoid,
      moon-shaped, moonlike, rivose, rivulose, roundabout, ruffled,
      semicircular, semilunar, serpentine, sickle-like, sickle-shaped,
      sinuate, sinuose, sinuous, snaky, torsional, tortile, tortuous,
      turning, twisting, twisty, two-horned, whorled, winding,
      wreathlike, wreathy