| 1. | a very slender line. |
| 2. | the lower edge of the hair, esp. along the upper forehead: a hairline that slowly receded. |
| 3. | worsted fabric woven with very fine lines or stripes. |
| 4. | Printing.
|
| 5. | narrow or fine as a hair: a hairline fracture. |
hairline hair·line (hâr'līn')
n.
The outline of the growth of hair on the head, especially across the front.