sigmoida. S字形的、乙狀結腸的、C字形的n. 乙狀結腸學術名詞S字形的:動物學、獸醫學S狀:畜牧學S形曲線:統計學乙狀的:醫學乙狀結腸:獸醫學英文釋義curved in two directions (like the letter S)of or relating to the sigmoid flexure in the large intestine