Hemitrope
Hemitrope , adjective
[Hemi- + Greek {not transcribed} to turn: compare French hémitrope.]
(Crystallography) Half turned round; half inverted; (Crystallography) having a twinned structure.
Hemitrope , noun
(Crystallography) That which is hemitropal in construction; (Crystallography) a twin crystal having a hemitropal structure.