up-wind

upwind

[adv., adj. uhp-wind; n. uhp-wind]
adverb
1.
toward or against the wind or the direction from which it is blowing: The hunters stalked upwind.
adjective
2.
moving or situated toward or in the direction from which the wind is blowing: an upwind leap; the upwind portions of the aircraft.
noun
3.
a wind that blows against one's course or up a slope.

Origin:
1830–40; up- + wind1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
upwind (ˈʌpˈwɪnd)
 
adv
1.  into or against the wind
2.  towards or on the side where the wind is blowing; windward
 
adj
3.  going against the wind: the upwind leg of the course
4.  on the windward side: the upwind side of the house has weathered

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

upwind
1838, from up- + wind. Originally a nautical term.
Online Etymology Dictionary, © 2010 Douglas Harper
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