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English definition of “hairline”

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hairline

noun [C] uk   /ˈheə.laɪn/ us    /ˈher-/
the edge of a person's hair, especially along the top of the forehead (= part of the face above the eyes): He's got a receding hairline (= he's losing his hair at the front of the head).

hairline

adjective [before noun] uk   /ˈheə.laɪn/ us    /ˈher-/
(of cracks or lines) very narrow: a hairline fracture
(Definition of hairline from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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