headwind

a primary resistance that limits the speed of cycling; measured as the speed of wind (the air pressure) that hits a cyclist in a frontal position, in the face, see sidewind.
Found on http://bikecult.com/bikecultbook/glossary_english.html

headwind

[n] - wind blowing opposite to the path of a ship or aircraft
Found on http://www.webdictionary.co.uk/definition.php?query=headwind
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