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[hair-lahyn] /ˈhɛərˌlaɪn/
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.
  1. a very thin line on the face of a type.
  2. a style of type consisting entirely of such lines.
  3. a thin rule for printing fine lines.
  4. undesirable vertical lines between letters, caused by worn matrices.
narrow or fine as a hair:
a hairline fracture.
Origin of hairline
1725-35; hair + line1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hairline
  • Today, a hairline crack runs above one of those rivets.
  • It had limited upgrade potential, and the translucent case suffered hairline cracks, which put many buyers off.
  • While his hairline has thinned further, his talents have not diminished.
  • If your hairline recedes any more, you'll have to start buying floor.
  • hairline shape is reportedly due to a single gene with a widow's peak dominant and a straight hairline recessive.
  • The westbound lane appeared to have more hairline, longitudinal cracks occurring than the eastbound side.
  • The hairline is low and motion of the neck is limited.
  • The ceramic potpourri burner may contain hairline cracks that can cause the burner to fracture or shatter while in use.
British Dictionary definitions for hairline


the natural margin formed by hair on the head
  1. a very narrow line
  2. (as modifier): a hairline crack
  1. a thin stroke in a typeface
  2. any typeface consisting of such strokes
  3. thin lines beside a character, produced by worn or poorly cast type
a rope or line of hair
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for hairline

"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.

Online Etymology Dictionary, © 2010 Douglas Harper
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hairline in Medicine

hairline hair·line (hâr'līn')
The outline of the growth of hair on the head, especially across the front.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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