An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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rarefaction wave
  موج ِ آلرش  
mowj-e âlareš
Fr.: onde de raréfaction  

A pressure wave in a fluid generated by rarefaction. It travels in the opposite direction to that of a shock wave in the medium.

See also: → rarefaction; → wave.