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The Collaborative International Dictionary of English v.0.48 (gcide)

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]