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

All the forms are pedions, each consisting of a single plane; they are thus hemihedral with respect to crystals of the last class.

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

In this way a mixture of the two asparagines was obtained, which were separated by picking out the hemihedral crystals.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" by Various

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

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

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

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