Definition of tar noun from the Oxford Advanced American Dictionary

     

    tar

     noun
    noun
    NAmE//tɑr//
     
    [uncountable]
     
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  1. 1 a thick, black, sticky liquid that becomes hard when cold. Tar is obtained from coal and is used especially in making roads
  2. 2a substance similar to tar that is formed by burning tobacco low-tar cigarettes
See the Oxford Advanced Learner's Dictionary entry: tar