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English definition of “hairline”

hairline

noun [C]  /ˈheərˌlɑɪn/ us  

hairline noun [C] (head)

the edge of a person's hair where it joins the top of the face

hairline

adjective [not gradable]  /ˈheərˌlɑɪn/ us  

hairline adjective [not gradable] (narrow)

(of cracks or lines) very narrow: a hairline fracture of a bone in the hand
(Definition of hairline from the Cambridge Academic Content Dictionary © Cambridge University Press)
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