The Collaborative International Dictionary
Mesometrium
Mesometrium \Mes`o*me"tri*um\, n. [NL. See Meso-, and Metrium.] (Anat.) The fold of the peritoneum supporting the oviduct.
Wiktionary
mesometrium
n. (context anatomy English) The fold of the peritoneum supporting the oviduct.
Wikipedia
Mesometrium
The mesometrium is the mesentery of the uterus. It constitutes the majority of the broad ligament of the uterus, excluding only the portions adjacent to the uterine tube (the mesosalpinx) and ovary (the mesovarium).
It is adjacent to the mesosalpinx.
The ureter is among the structures found in the mesometrium.