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trade wind

[wind] /wɪnd/
Also, trade winds. Also called trades. any of the nearly constant easterly winds that dominate most of the tropics and subtropics throughout the world, blowing mainly from the northeast in the Northern Hemisphere, and from the southeast in the Southern Hemisphere.
any wind that blows in one regular course, or continually in the same direction.
Origin of trade wind
1625-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for trade winds

trade wind

a wind blowing obliquely towards the equator either from the northeast in the N hemisphere or the southeast in the S hemisphere, approximately between latitudes 30° N and S, forming part of the planetary wind system
Word Origin
C17: from to blow trade to blow steadily in one direction, from trade in the obsolete sense: a track
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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trade winds in Science
trade winds
Winds that blow steadily from east to west and toward the equator over most of the Torrid Zone. The trade winds are caused by hot air rising at the equator, with cool air moving in to take its place from the north and from the south. The winds are deflected westward because of the Earth's west-to-east rotation. Compare antitrades.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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