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