Definition of mastic noun from the Oxford Advanced American Dictionary

     

    mastic

     noun
    noun
    NAmE//ˈmæstɪk//
     
    [uncountable]
     
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  1. 1a substance that comes from the bark of a tree and is used in making varnish
  2. 2a substance that is used in building to fill holes and keep out water
See the Oxford Advanced Learner's Dictionary entry: mastic