rectum

from WordNet (r) 3.0 (2006)
rectum
    n 1: the terminal section of the alimentary canal; from the
         sigmoid flexure to the anus
    
from The Collaborative International Dictionary of English v.0.48
Rectum \Rec"tum\ (-t?m), n. [NL. (sc. intestinum), fr. L. rectus
   straight. See {Right}.] (Anat.)
   The terminal part of the large intestine; -- so named because
   supposed by the old anatomists to be straight. See Illust.
   under {Digestive}.
   [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
43 Moby Thesaurus words for "rectum":
      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

    

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