holohedral, a. Cryst.
(hɒləʊˈhiːdrəl, -ˈhɛdrəl)
[f. holo- + Gr. ἕδρα seat, base + -al1.]
Of a crystal: Having the full number of planes required by the highest degree of symmetry belonging to its system.
| 1837 Dana Min. i. (1844) 38 The holohedral and hemihedral forms may be separately considered. 1855 W. A. Miller Chem. 103 Hemihedral forms..may be derived from a holohedral form, as the tetrahedron is from the octahedron. |
So holoˈhedrism, the condition or quality of being holohedral, crystallization in holohedral forms. holoˈhedron [cf. F. holoèdre], a holohedral crystal or form.
| (In mod. Dicts.) |