| 单词 | point group |
| 释义 | point group in British Englishnoun crystallography another term for crystal class crystal class in British Englishnoun crystallography any of 32 possible types of crystals, classified according to their rotational symmetry about axes through a point Also called: point group point group in American Englishnoun Crystallography a class of crystals determined by a combination of their symmetry elements, all crystals left unchanged by a given set of symmetry elements being placed in the same class Also called: symmetry class Word origin [1900–05]This word is first recorded in the period 1900–05. Other words that entered Englishat around the same time include: desensitize, elder statesman, geopolitics, hookup, hormone |
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