HEMITROPE
Etymology
Adjective
hemitrope (not comparable)
Half turned round; half inverted; (crystallography) having a twinned structure.
Noun
hemitrope (plural hemitropes)
(crystallography) A twin crystal having a hemitropal structure.
Source: Wiktionary
Hem"i*trope, a. Etym: [Hemi- + Gr. hémitrope.]
Definition: Half turned round; half inverted; (Crystallog.) having a
twinned structure.
Hem"i*trope, n.
Definition: That which is hemitropal in construction; (Crystallog.) a twin
crystal having a hemitropal structure.
Source: Webster’s Unabridged Dictionary 1913 Edition