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blue line

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noun Ice Hockey.
  1. either of two lines of the color blue that are parallel to and equidistant from the goal lines and divide the rink into three zones of equal size.Also called zone line.Compare end zone(def 2), neutral zone.
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Origin of blue line

First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

blue line in Medicine

blue line

n.
  1. A bluish line along a border of the gums resulting from chronic lead poisoning.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.