An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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barrel distortion
  چولگی ِ چلیکی  
cowlegi-ye celiki (#)
Fr.: distortion en barillet  

A defect in an optical system in which magnification decreases with distance from the optical axis,
whereby the image of a square appears barrel-shaped. Opposite of → pincushion distortion.

Etymology (EN): Barrel, M.E. barel, from O.Fr. baril; → distortion.

Etymology (PE): Cowlegi, → distortion; celiki, relating to celik “barrel”.