trade-wind

trade wind

[wind]
noun
1.
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.
2.
any wind that blows in one regular course, or continually in the same direction.

Origin:
1625–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
trade wind (wɪnd)
 
n
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
 
[C17: from to blow trade to blow steadily in one direction, from trade in the obsolete sense: a track]

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