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zone line

noun, Ice Hockey.
1.

blue line

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.
Origin
1925-1930
1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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zone-line in Medicine

blue line n.
A bluish line along a border of the gums resulting from chronic lead poisoning.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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13
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