any localized airflow.
Also, air stream, air-stream.

1865–70; air1 + stream Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
airstream (ˈɛəˌstriːm)
1.  a wind, esp at a high altitude
2.  a current of moving air

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
It wasn't until the temperature and humidity of the airstream were increased
  that there were noticeable effects.
Their pattern is dictated by geometries of airstream collision far below.
Airstream is one of the best-known names in trailers.
My guess is that it is about eddies in the airstream.
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