Meaning of “hairline” in the English Dictionary

"hairline" in American English

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hairlinenoun [ C ]

us /ˈheərˌlɑɪn/

hairline noun [ C ] (head)

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

hairlineadjective [ not gradable ]

us /ˈheərˌlɑɪn/

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)