An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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aperture efficiency
  کار‌آیی ِ دهانه  
kârâyi-ye dahâné
Fr.: efficacité d'ouverture  

The ratio of the → effective aperture of a radio telescope to the true aperture.

See also: → aperture; → efficiency.