An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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optical counterpart
  همتایِ نوری  
hamtâ-ye nuri
Fr.: contrepartie optique  

An astronomical object with usually weak emission in the → visible found to be the optical representation of the object radiating chiefly in other
→ wavelengths of the → electromagnetic spectrum.

See also: → optical; → counterpart.