American English

Definition of hairline noun from the Oxford Advanced American Dictionary

     

    hairline

     noun
    noun
    NAmE//ˈhɛrlaɪn//
     
     
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  1. 1the edge of a person's hair, especially at the front a receding hairline
  2. 2(often used as an adjective) a very thin crack or line a hairline crack/fracture
See the Oxford Advanced Learner's Dictionary entry: hairline