white line

noun
1.
a stripe of white paint, tiles, or the like, that marks the center or outer edge of a road.
2.
a white layer in a horse's hoof.
3.
any blank or white part, line, stripe, or margin.

Origin:
1590–1600

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
white line
 
n
1.  a line or strip of white in the centre of a road to separate traffic going in different directions
2.  a white lamination in the hoof of a horse

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

white line n.
See linea alba.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
His golf swing appears as a tangled, incredibly complicated white line in the
  gloom, a spaghetti dinner of light.
The skin of cod is white, heavily mottled with gray, with a white line running
  the entire length of fish on either side.
On perched bird, wing patch shows only as a thin white line along the leading
  edge of the folded wing.
The white line marks the day-night boundary, so it'll be late afternoon locally
  at the predicted re-entry location.
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