a. S字形的, 乙状结肠的, C字形的

n. 乙状结肠

[医] 乙状的; 乙状结肠

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].

{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}.