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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
polar front
–noun
Meteorology. the variable frontal zone of middle latitudes separating air masses of polar and tropical origin.
[Origin: 1915–20]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Encyclopædia Britannica, Inc.
Polar front

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American Heritage Dictionary - Cite This Source - Share This
polar front  
n.   The region or boundary separating air masses of polar origin from those of tropical or subtropical origin.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
WordNet - Cite This Source - Share This
polar front

noun
the front of an advancing mass of colder air [syn: cold front] 

WordNet® 3.0, © 2006 by Princeton University.
The American Heritage Science Dictionary - Cite This Source - Share This
polar front  
The region or boundary separating air masses of polar origin from those of tropical or subtropical origin. The position of the polar front during winter in a particular hemisphere is at approximately 30° latitude, while in the summer it is at approximately 60° latitude. The convergence of warm and cool air masses along the polar front often produces cyclonic wind systems.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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