hemihedral

/hem-i-hee-druhl/US // ˌhɛm ɪˈhi drəl //UK // (ˌhɛmɪˈhiːdrəl) //

半球体,半面体,半球状,半球型

Definitions

adj.形容词 adjective

1
- : having only half the planes or faces required by the maximum symmetry of the system to which it belongs.

In this species the hemihedral variety, Hemiaspis, often occurs.
In this way a mixture of the two asparagines was obtained, which were separated by picking out the hemihedral crystals.
All the forms are pedions, each consisting of a single plane; they are thus hemihedral with respect to crystals of the last class.
These systems, however, only represented holohedral forms, leaving the hemihedral and tetartohedral classes to be explained.
The occurrence of hemihedral faces was considered by Pasteur to be a sufficient criterion for an optically active substance.