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Entry 1 sense Webster, 1913

Rectum

/(-t?m)/ · Rec·tum · IPA /ˈɹɛktəm/
01 n. The terminal part of the large intestine; -- so named because supposed by the old anatomists to be straight. See Illust. under Digestive.
  1. 1.
    The terminal part of the large intestine; -- so named because supposed by the old anatomists to be straight. See Illust. under Digestive.(Anat.) See: Digestive