• (America) IPA: /ˈhɛɹˌlaɪn/

hairline (plural hairlines)

  1. The line along one's forehead where hair starts growing.
    It's just a receding hairline — it's not like you're going bald.
  2. A very thin line in writing, drawing, or typography.
  3. A fishing line made from hair.
  4. A very thin fissure.
    While inspecting the new house, we found a few hairlines in one of the walls.


  1. very thin, as thin as a hair
    There was a hairline crack in the airplane's wing.

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