Meaning of “rectum” in the English Dictionary

"rectum" in American English

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rectumnoun [ C ]

us /ˈrek·təm/

the lowest end of the bowels, through which excrement passes as it leaves the body

rectal
adjective [ not gradable ] us /ˈrek·təl/

She took the baby’s temperature with a rectal thermometer.

(Definition of “rectum” from the Cambridge Academic Content Dictionary © Cambridge University Press)