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

Derived Forms

• hemihedrally
  adverb

Etymology

Origin of hemihedral

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

Example Sentences

It may be considered as the hemihedral form of the ditetragonal bipyramid.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various

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 Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various

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 Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various

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

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various

Corresponding to each of these hemihedral forms there is another geometrically similar form, differing, however, not only in orientation, but also in actual crystals in the characters of the faces.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7 "Crocoite" to "Cuba" by Various