D defs.my
Entry 2 senses Webster, 1913

hairline

· IPA /ˈhɛɹˌlaɪn/
01 n. a very thin line.
  1. 1.
    a very thin line.
  2. 2.
    the natural margin formed by hair on the head, especially the edge of growth of hair on the forehead; as, a receding hairline.