This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of omentum.

"The serous coat (tunica serosa) is derived from the peritoneum, and covers the entire surface of the organ, excepting along the greater and lesser curvatures at the points of attachment of the greater and lesser omenta; here the two layers of peritoneum leave a small triangular space, along which the nutrient vessels and nerves pass."