An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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osculating sphere
  سپهرِ آبوسنده، کره‌یِ آبوسنده  
sepehr-e âbusandé, kore-ye ~
Fr.: sphère osculatrice  

For a curve C at a point p, the limiting sphere obtained by taking the sphere that passes through p and three other points on C and then letting these three points approach p independently along C.

See also: → osculating; → sphere.