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Wordnet 3.0

NOUN (1)

1. a fold of peritoneum supporting the viscera;

The Collaborative International Dictionary of English v.0.48:

Omentum \O*men"tum\, n.; pl. Omenta. [L.] (Anat.) A free fold of the peritoneum, or one serving to connect viscera, support blood vessels, etc.; an epiploon. [1913 Webster] Note: The great, or gastrocolic, omentum forms, in most mammals, a great sac, which is attached to the stomach and transverse colon, is loaded with fat, and covers more or less of the intestines; the caul. The lesser, or gastrohepatic, omentum connects the stomach and liver and contains the hepatic vessels. The gastrosplenic omentum, or ligament, connects the stomach and spleen. [1913 Webster]
WordNet (r) 3.0 (2006):

omentum n 1: a fold of peritoneum supporting the viscera