The AI-powered English dictionary
plural hairlines
The line along one's forehead where hair starts growing. quotations examples
Using a Danish technique, doctors can now insert plugs of just one or two hairs in front of an implanted area to simulate a natural hairline.
1984 May 28, Claudia Wallis, “Gone Today, but Hair Tomorrow”, in Time
A very thin line in writing, drawing, or typography. examples
A fishing line made from hair. examples
A very thin fissure. quotations examples
Yup, you got a crack in it [the cylinder head] all right. Just a hairline, but that damn thing is gonna cause a big headache later.
2012, The Onion Book of Known Knowledge, page 102
(figurative) Very thin, as thin as a hair. examples