An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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isophotal radius
  شعاع ِ ایزوشیدی  
šo'â'-e izošidi
Fr.: rayon isophotal  

The size attributed to a galaxy corresponding to a particular level of → surface brightness. The reason is that galaxies do not have sharp edges.

See also: → isophotal; → radius.