An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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osculating circle
  پرهونِ آبوسنده  
parhun-e âbusandé
Fr.: cercle osculateur  

The circle that touches a curve (on the concave side) and whose radius is the radius of curvature.

See also: → osculating; → circle.