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tripe 
  n 
1 the stomach lining of an ox, cow, or other ruminant, prepared for cooking 
2 Informal something silly; rubbish 
3 pl 
Archaic, informal intestines; belly 
  (C13: from Old French, of unknown origin) 


rock tripe 
  n  (Canadian) any of various edible lichens, esp. of the genus Umbilicaria, that grow on rocks and are used in the North as a survival food 

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