An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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subsonic
  زیر-صدایی  
zir-sedâyi
Fr.: subsonique  

Describing a speed that is less than the speed of sound in the medium concerned. → supersonic.

See also: → sub-; → sonic.