stationary front

noun Meteorology.
a front between warm and cold air masses that is moving very slowly or not at all.

1935–40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
stationary front   (stā'shə-něr'ē)  Pronunciation Key 
A transition zone between two nearly stationary air masses of different density. See more at front.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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