An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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rotational motion
  جنبش ِ چرخشی  
jonbeš-e charkheshi
Fr.: mouvement de rotation  

Of a → rigid body, a motion in which there are always two points of the body which remain motionless.

See also: → rotational; → motion.