(in the terminology of N. Story-Maskelyne) designating zones (zone, n. 8b) having a crystal face in common.

Having the full number of normals required by the complete symmetry of its system. Opposed to merosystematic.

designating merohedral forms of which corresponding points or faces can be brought into congruence by revolution about an axis.

see quot.

having or exhibiting all the axes of symmetry compatible with one another but no plane or centre of symmetry; (also more widely) having one or more…