rectum

American  

[rek-tuhm] / ˈrɛk təm /

noun

Anatomy.

rectums, plural recta plural

1. the comparatively straight, terminal section of the intestine, ending in the anus.

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rectum British  

/ ˈrɛktəm /

noun

1. the lower part of the alimentary canal, between the sigmoid flexure of the colon and the anus

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rectum Scientific  

/ rĕk′təm /

rectums plural

1. The last section of the digestive tract, extending from the colon to the anus, in which feces is stored for elimination from the body.

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rectum Cultural  

1. The outermost portion of the large intestine. Feces are stored in the rectum until they are passed out of the body through the anus.

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Other Word Forms

Noun Inflected Forms

• recta
  plural
• rectums
  plural

Etymology

Origin of rectum

1535–45; < New Latin rēctum ( intestīnum ) the straight (intestine)

Example Sentences

You’re also at risk of developing hemorrhoids—swollen veins in the anus and lower rectum that can cause pain and bleeding—according to a study that came out last week.

From Slate • Sep. 12, 2025

When he arrived to see what the birds were eating, he found a dead cow, its rectum and udders torn away — classic wolf kill.

From Los Angeles Times • Apr. 21, 2025

Ulcerative colitis affects the innermost lining of the large intestine, also called the colon and rectum.

From Science Daily • Jun. 3, 2024

According to the NHS, external-link ulcerative colitis - which Fitzwater admits he had never heard of - is a long-term condition where the colon and rectum become inflamed.

From BBC • Feb. 15, 2024

Strings of them ran over the surfaces of the liver, diaphragm, intestine, appendix, rectum, and heart.

From "The Immortal Life of Henrietta Lacks" by Rebecca Skloot