Noun hairline has 2 senses
  1. hairline - a very thin line
    --1 is a kind of
    line
    --1 has particulars: hair stroke
  2. hairline - the natural margin formed by hair on the head
    --2 is a kind of
    boundary, bound, bounds
    --2 is a part of hair
    --2 has part: widow's peak
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