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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.

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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;
From wordnet.princeton.edu