An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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helium abundance
  فراوانی ِ هلیوم  
farâvâni-ye heliom
Fr.: abondance de l'hélium  

The relative amount of helium with respect to another → chemical species, usually → hydrogen, in an astronomical object.

See also: → helium; → abundance.