merohedral

merohedral

[¦mer·ə¦hē·drəl]
(crystallography)
Of a crystal class in a system, having a general form with only one-half, one-fourth, or one-eighth the number of equivalent faces of the corresponding form in the holohedral class of the same system. Also known as merosymmetric.
References in periodicals archive ?
An extreme case is a merohedral twin for which S = 1 in which the lattice is continuous through the twin boundary.