sigmoid
Americanadjective
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shaped like the letter C.
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shaped like the letter S.
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of, relating to, or situated near the sigmoid flexure of the large intestine.
adjective
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shaped like the letter S
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of or relating to the sigmoid colon of the large intestine
noun
Other Word Forms
Etymology
Origin of sigmoid
First recorded in 1660–70, sigmoid is from the Greek word sigmoeidḗs shaped like a sigma. See sigma, -oid
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Ozaki died "due to stage 4 sigmoid colon cancer" on Tuesday, his son, Tomoharu, said Wednesday in a statement obtained by AFP.
From Barron's ● Dec. 24, 2025
In July of 2021, Francis had half of his colon removed after a narrowing of the sigmoid portion of the large intestine, the Associated Press reported at the time.
From Washington Times ● Jun. 12, 2022
In surgeries like the one Francis most likely underwent, doctors excise a part of the colon called the sigmoid colon where diverticulitis is most common.
From New York Times ● Jul. 5, 2021
Francis had developed a diverticular stenosis, or narrowing, of the sigmoid portion of the large intestine.
From Seattle Times ● Jul. 5, 2021
Should, therefore, the feces have passed into the rectum and the desire to stool be not responded to—though the desire continue urgent—the feces will be returned to the sigmoid cavity by physiological action.
From Intestinal Ills Chronic Constipation, Indigestion, Autogenetic Poisons, Diarrhea, Piles, Etc. Also Auto-Infection, Auto-Intoxication, Anemia, Emaciation, Etc. Due to Proctitis and Colitis by Alcinous B. (Alcinous Burton) Jamison
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
