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Symmetry about perpendicular axes.
Geometry and Crystallography. Applied to a solid figure with triangular faces, or having some other relation to a triangle. Also, Having a…
Same as holohedrism n.; opposed to merosymmetry.
a variety of merosymmetry, in which only one fourth of the faces of the holosymmetrical form are retained.
Crystallography. In a crystalline structure: the state of appearing unchanged in orientation following displacement.