Definition of point group in English:

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point group

noun

Crystallography
Any of the 32 sets of symmetry operations which can be used to characterize three-dimensional lattices and are the basis of the system of crystal classes.
Example sentences
  • It crystallizes in the hexagonal system; its point group is thought to be 6 / m 2 / m 2 / m, although there is debate on its structure and symmetry.
  • A new method was devised to deduce the orientation of the C 3 trimer axis with respect to the unit cell framework without any other input from the x-ray crystallographic analysis than the 222 point group of the unit cell.
  • When taking into account the point group of the cocrystals (222 corresponding to the orthorhombic space group), the squares of the direction cosines between all C 3 axes and (a, b, c) should be identical.

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