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hairline

noun

  1. Historical a line, cord, etc. made of hair
  2. a very thin line
    1. a very thin stripe
    2. cloth patterned with such stripes
  3. a very narrow margin or degree of difference
  4. the outline of the hair on the head, esp. of the hair above the forehead
  5. Printing a very thin stroke on a typeface or impression

adjective

of or characterized by a tiny crack or small difference

See hairline in American Heritage Dictionary 4

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hairline

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