Definition of hillbilly noun from the Oxford Advanced American Dictionary

     

    hillbilly

     noun
    noun
    NAmE//ˈhɪlˌbɪli//
     
    (pl. hillbillies)
     
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  1. 1 [countable] (disapproving) a person who lives in the mountains and is thought to be stupid by people who live in the towns
  2. 2 [uncountable] a type of country music that began in the mountains of the southern states of the U.S.
See the Oxford Advanced Learner's Dictionary entry: hillbilly