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prevailing wind

prevailing wind in Science
prevailing wind
  (prĭ-vā'lĭng)   
A wind that blows predominantly from a single general direction. The trade winds of the tropics, which blow from the east throughout the year, are prevailing winds. See illustration at wind.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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