A fold of peritoneum extending from the stomach to adjacent organs in the abdominal cavity: Omentum is used in the sense of "pertaining to either pair of peritoneal folds that connect the stomach to the adjacent organs".

Three divisions of the omentum are commonly recognized:

• The gastro-colic or greater omentum descending over a part of the intestines from the lower border of the stomach to the transverse colon.
• The gastro-hepatic, hepato-gastric, or lesser omentum extending from the liver to the smaller curvature of the stomach.
• The gastro-splenic omentum connecting the cardiac end of the stomach with the spleen.