The Collaborative International Dictionary
Mesorectal
Mesorectum \Mes`o*rec"tum\, n. [Meso- + rectum.] (Anat.) The fold of peritoneum, or mesentery, attached to the rectum. -- Mes`o*rec"tal, a.
Wiktionary
mesorectal
a. (context anatomy English) Of or pertaining to the middle part of the rectum