What is "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].

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.

a. (context statistics English) Characterized by a sigmoid curve or function

adj. of or relating to the sigmoid flexure in the large intestine [syn: sigmoid]

Sigmoidal or sigmoid, literally means S-shaped and can refer to:

• Sigmoid function
• Sigmoidal artery
• Sigmoid colon

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