An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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atomic clock
  ساعت ِ اتمی  
sâat-e atomi
Fr.: horloge atomique  

A modern clock, in which the characteristic frequencies of certain atoms (most commonly chosen cesium 133) are utilized for precision time measurement. → atomic fountain clock.

See also: → atomic; → clock.