space group


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space group ‎(plural space groups)

  1. (crystallography, mineralogy) The set of all symmetry operations that can be applied to a given crystal without changing it.
    • 1998, Georgina Ferry, Dorothy Hodgkin: A Life:
      Dorothy also learned to identify the space group of a molecule, an essential prerequisite for finding the structure, by looking for spots that were missing from the regular array in an X-ray photograph.
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