An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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observer
  نپاهنده، نپاهشگر، نپاهگر  
nepâhandé, nepâhešgar, nepâhgar
Fr.: observateur  

  1. Someone or something that observes.

  2. Idealized person or piece of equipment, often hypothetical, that measures relevant properties of a physical system.

See also: Agent noun, from → observe + → -or.