Etymology
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hairline (n.)

also hair-line, "cord made of hair," 1731, from hair + line (n.). 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., 1904.

updated on May 16, 2015

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Definitions of hairline from WordNet

hairline (n.)
a very thin line;
hairline (n.)
the natural margin formed by hair on the head;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.