sigmoid

1. Having the shape of the letter S.
2. Of or relating to the sigmoid colon.

[Greek sīgmoeidēs : sīgma, sigma; see sigma + -oeidēs, -oid.]

Of or pertaining to an S shape, as in the shape of the pelvic end of the colon prior to its joining the rectum.

Shaped like the letter C or S.

• s. colon — the distal part of the colon of some species, such as humans, shaped like an S, from the level of the iliac crest to the rectum.
• s. curve — an S-shaped curve of the relationship between two variables.
• s. flexure of the penis — situated in the bull's penis dorsal and caudal to the scrotal neck.

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Sigmoid means resembling the lower-case Greek letter sigma (ς). Specific uses include:

• Sigmoid function, a mathematical function
• Sigmoid colon, part of the large intestine or colon

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