Dictionary.com
Thesaurus.com

upwind

American  
[uhp-wind, uhp-wind] / ˈʌpˈwɪnd, ˈʌpˌwɪnd /

adverb

  1. toward or against the wind or the direction from which it is blowing.

    The hunters stalked upwind.


adjective

  1. moving or situated toward or in the direction from which the wind is blowing.

    an upwind leap; the upwind portions of the aircraft.

noun

  1. a wind that blows against one's course or up a slope.

upwind British  
/ ˈʌpˈwɪnd /

adverb

  1. into or against the wind

  2. towards or on the side where the wind is blowing; windward

"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

adjective

  1. going against the wind

    the upwind leg of the course

  2. on the windward side

    the upwind side of the house has weathered

"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

Etymology

Origin of upwind

First recorded in 1830–40; up- + wind 1