Webster's English Dictionary

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sigmoid

sig.moid \-.mo.id\ \sig-'mo.id-*l-e-\ aj [Gk sigmoeide-s, fr. sigma; fr. a 
   common form of sigma shaped li]ke the Roman letter C 1a: curved like the 
   letter C  1b: curved in two directions like the letter S  2: of, relating 
   to, or being the sigmoid flexure of the intestine  - sig.moi.dal.ly av