Definition of rectum noun from the Oxford Advanced American Dictionary

 

rectum

 noun
noun
NAmE//ˈrɛktəm//
 
(pl. rectums, (or )recta
NAmE//ˈrɛktə//
 
)
(anatomy)
 
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the end section of the tube where food waste collects before leaving the body through the anus
See the Oxford Advanced Learner's Dictionary entry: rectum