hemihedral

American  

[hem-i-hee-druhl] / ˌhɛm ɪˈhi drəl /

adjective

1. (of a crystal) having only half the planes or faces required by the maximum symmetry of the system to which it belongs.

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hemihedral British  

/ ˌhɛmɪˈhiːdrəl /

adjective

1. (of a crystal) exhibiting only half the number of planes necessary for complete symmetry

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Other Word Forms

• hemihedrally adverb

Etymology

Origin of hemihedral

First recorded in 1830–40; hemi- + -hedral

Example Sentences

The remaining simple forms are “hemihedral with parallel faces,” and from the corresponding holohedral forms two hemihedral forms, a positive and a negative, may be derived.

From Project Gutenberg

They crystallize in two complementary hemihedral forms, which are respectively right-handed and left-handed, i.e. enantiomorphous forms.

From Project Gutenberg

By some authors these two divisions are treated as separate systems; or again the rhombohedral forms may be considered as hemihedral developments 580 of the hexagonal.

From Project Gutenberg

These systems, however, only represented holohedral forms, leaving the hemihedral and tetartohedral classes to be explained.

From Project Gutenberg

Crystals belonging to many of the hemihedral and tetartohedral classes of the six systems of crystallization are devoid of a centre of symmetry.

From Project Gutenberg