Head wind

headwind

[hed-wind]
noun
a wind opposed to the course of a moving object, especially an aircraft or other vehicle (opposed to tailwind ).

Origin:
1780–90; (a)head + wind1

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Collins
World English Dictionary
headwind (ˈhɛdˌwɪnd)
 
n
Compare tailwind a wind blowing directly against the course of an aircraft or ship

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
headwind or head wind   (hěd'wĭnd')  Pronunciation Key 
A wind blowing directly against the course of a moving object, especially an aircraft or ship.
The American Heritage® Science Dictionary
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