| rectum | | |
| n. (body) | 1. rectum | the terminal section of the alimentary canal; from the sigmoid flexure to the anus. |
| ~ body part | any part of an organism such as an organ or extremity. |
| ~ arteria rectalis, rectal artery | one of the arteries supplying the rectal area. |
| ~ large intestine | beginning with the cecum and ending with the rectum; includes the cecum and the colon and the rectum; extracts moisture from food residues which are later excreted as feces. |
| ~ anus | the excretory opening at the end of the alimentary canal. |
| sacrum | | |
| n. (body) | 1. sacrum | wedge-shaped bone consisting of five fused vertebrae forming the posterior part of the pelvis; its base connects with the lowest lumbar vertebra and its tip with the coccyx. |
| ~ bone, os | rigid connective tissue that makes up the skeleton of vertebrates. |
| ~ sacral vertebra | one of 5 vertebrae in the human spine that fuse in the adult to form the sacrum. |
| ~ pelvic arch, pelvic girdle, pelvis, hip | the structure of the vertebrate skeleton supporting the lower limbs in humans and the hind limbs or corresponding parts in other vertebrates. |
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