An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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instrumental flexure
  چفتگی ِ سازال  
caftegi-ye sâzâl
Fr.: flexion d'instrument  

An image defect caused by the mechanical flexure of materials; for example the curved-shape image of a long slit in a spectrograph.

See also: → instrumental; → flexure.