noun
- a very slender line.
- the lower edge of the hair, especially along the upper forehead: a hairline that slowly receded.
- worsted fabric woven with very fine lines or stripes.
- Printing.
adjective
- narrow or fine as a hair: a hairline fracture.
noun
- the natural margin formed by hair on the head
-
- a very narrow line
- (as modifier)a hairline crack
- printing
- a thin stroke in a typeface
- any typeface consisting of such strokes
- thin lines beside a character, produced by worn or poorly cast type
- a rope or line of hair
“cord made of hair,” 1731, from hair + line. Meaning “a very fine line” is from 1846. As “the outline of the hair on top of the head,” by 1903. As an adjective, of cracks, etc., by 1923.
n.
- The outline of the growth of hair on the head, especially across the front.