An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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space group
  گروه ِ فضایی  
goruh-e fazâyi
Fr.: groupe d'espace  

Set of operations (rotation about an axis, reflection across a plane, translation, or combination of these) which when carried out on a periodic arrangement of points in space brings the system of points to self-coincidence.

Etymology (EN): The word group comes from the mathematical notion of a group.