Definition of hairline noun from the Oxford Advanced Learner's Dictionary

     

    hairline

     noun
    noun
    BrE BrE//ˈheəlaɪn//
     
    ; NAmE NAmE//ˈherlaɪn//
     
    Describing hair, Face
     
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  1. 1the edge of a person’s hair, especially at the front a receding hairline See related entries: Describing hair, Face
  2. 2(often used as an adjective) a very thin crack or line a hairline crack/fracture
See the Oxford Advanced American Dictionary entry: hairline