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me·so·rec·tum .mez-ə-'rek-təm, .mēz-, .mēs-, .mes- n, pl -tums or -ta -tə the mesentery that supports the rectum
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meso·rec·tum (mez″o-) (me″zo-rekґtəm) [meso- + rectum] the fold of peritoneum connecting the upper portion of the rectum with the sacrum. mesorectal adjMedical dictionary. 2011.