colorectum

noun
co·​lo·​rec·​tum | \ˌkō-lə-ˈrek-təm, ˌkäl-ə- \
plural colorectums or colorecta\-​tə \

Medical Definition of colorectum 

: the colon and the rectum Similar risks across time intervals were observed among participants with a history of adenoma in the proximal colon or distal colorectum.— Reiko Nishihara et al., The New England Journal of Medicine, 10 Sept. 2013

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