the air flowing past or through a moving body, as an airplane or automobile.

1910–15; air1 + flow Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
airflow (ˈɛəˌfləʊ)
the flow of air in a wind tunnel or past a moving aircraft, car, train, etc; airstream

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
Slope also affects airflow: warm air rises, cold air sinks.
New research shows that, unlike cigarettes, smoking marijuana from time to time
  may even increase lung airflow rates and capacity.
Houses were designed with airflow in mind-- more windows, higher ceilings.
The jagged edge mixes the airflow coming out of the jet engine in a way that
  reduces turbulence.
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