rectum
n. C1 Advanced US //ˈɹɛktəm// UK //ɹˈɛktəm// rec·tum
n. the final part of the large intestine before the anus. It is where waste is stored until you pass it out of your body.
n. the terminal part of the large intestine, situated between the sigmoid colon and the anus. It functions as a temporary reservoir for fecal matter before defecation.
The rectum stores waste until it is time to go to the bathroom.
The rectum is lined with specialized mucous membranes that help protect the sensitive tissues from the abrasive effects of fecal matter during the passage of waste.
Borrowed from New Latin rectum, clipping of Latin rectum intestinum (literally “the straight intestine”), rectum, neuter of rectus (“straight”). See right.