haplohedraladj.
/ˌhaplə(ʊ)ˈhiːdr(ə)l/, U.S. /ˌhæploʊˈhidr(ə)l/ Crystallography. Now historical and rare.
Of a system or form: bearing only one face corresponding to each normal.
ΘΚΠ
the world > matter > chemistry > crystallography (general) > crystal (general) > crystal systems > [adjective] > haplohedral
haplohedral1878
1878 H. P. Gurney Crystallogr. 54. [Discussing terms suggested in a lecture by N. S. Maskelyne.] A haplohedral form is one in which each normal bears only a single face.
1895 N. Story-Maskelyne Crystallogr. v. 105 Where for each of its origin-planes the system or form belonging to it has only one plane extant parallel to the origin-plane, the system or form will be termed haplohedral.
1939 Mineralogical Mag. 25 254 Story-Maskelyne..introduced such terms as haplohedral and diplohedral, holosystematic and hemisystematic, which unnecessarily complicated his nomenclature.
This entry has been updated (OED Third Edition, December 2013; most recently modified version published online March 2022).
<
adj.1878