Source : Webster's Revised Unabridged Dictionary (1913)

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 epiplo["o]n.

   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.

Source : WordNet®

omentum
     n : a fold of peritoneum supporting the viscera
     [also: {omenta} (pl)]

omenta
     See {omentum}