An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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observational
  نپاهشی  
nepâheši
Fr.: observationnel  

Pertaining to, or founded on observation, especially based on observation rather than theory.

See also: Adj. of → observation.