WordReference Random House Unabridged Dictionary of American English © 2015
o•men•tum  (ō mentəm), 
n., pl. -ta(-tə). 

    Anatomya fold of the peritoneum connecting the stomach and the abdominal viscera forming a protective and supportive covering. Cf.greater omentum, lesser omentum. 
  • Latin ōmentum caul surrounding the intestines
  • 1535–45
o•mental, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::

omentum /əʊˈmɛntəm/ n ( pl -ta / -tə/)
  1. a double fold of peritoneum connecting the stomach with other abdominal organs
Etymology: 16th Century: from Latin: membrane, esp a caul, of obscure origin

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