nounpl. -·tums or -·ta
the lowest, or last, segment of the large intestine, extending, in humans, from the sigmoid flexure to the anus
Origin of rectumModern Latin from Classical Latin rectum (intestinum), literally , straight (intestine) from rectus: see recti-
nounpl. rec·tums, or rec·ta
The terminal portion of the large intestine, extending from the sigmoid colon to the anal canal.
Origin of rectumMiddle English from Latin (intestīnum) rēctum straight (intestine) neuter of rēctus ; see reg- in Indo-European roots.
(plural recta or rectums)