| Rectum (n.) The terminal part of the large intestine; -- so named because supposed by the old anatomists to be straight. See Digestive. Thesaurus Entries abdomen, anus, appendix, blind gut, bowels, brain, cecum, colon, duodenum, endocardium, entrails, foregut, giblets, gizzard, guts, heart, hindgut, innards, inner mechanism, insides, internals, intestine, inwards, jejunum, kidney, kishkes, large intestine, liver, liver and lights, lung, midgut, perineum, pump, pylorus, small intestine, spleen, stomach, ticker, tripes, vermiform appendix, viscera, vitals, works |