Definition of gargantuan adjective from the Oxford Advanced American Dictionary

     

    gargantuan

     adjective
    adjective
    NAmE//ɡɑrˈɡæntʃuən//
     
    [usually before noun]
     
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  1. 1extremely large synonym enormous
  2. 2 a gargantuan appetite/meal
See the Oxford Advanced Learner's Dictionary entry: gargantuan